SlideShare ist ein Scribd-Unternehmen logo
1 von 27
Downloaden Sie, um offline zu lesen
Objective Structured Practical
Question (OSPE)
Topic: Optics
According to the course curriculum of
Bangladesh College of Physician &
Surgeon (BCPS)
AUTHOR:
Dr Md Anisur Rahman Anjum.
MBBS (Dhaka Medical College). DO (Dhaka
University) FCPS (EYE)
Associate Professor
National Institute of Ophthalmology
Dhaka, Bangladesh.
Chamber: Mojibunnessa Eye Hospital
House: 18 Road: 6. Dhanmondi, Dhaka, 1205.
Bangladesh.
Email: anjumk38dmc@gmail.com
Cell: 01711-832397
7/14/2014 2anjumk38dmc@gmail.com
OSPE:1
7/14/2014 3anjumk38dmc@gmail.com
Question
The following are the results of the
retinoscopy on a 20 year-old man using a
streak retinoscope.(Assuming a working
distance of 2/3 metre)
OD With the streak in the vertical meridian
and sweep horizontally, the retina reflex is
neutralized with +0.50D. With the streak in
the horizontal meridian and sweep vertically,
the retina reflex is neutralized with -1.00D.
7/14/2014 4anjumk38dmc@gmail.com
Question
 OS With the streak orientated at 30o and sweep at
120o, the retina reflex is neutralized with +1.00D.
With the streak orientated at 120o and sweep at 30o,
the retina reflex is neutralized with -0.50D
Question: 1
Draw the power cross (taking into account the working
distance). = 5
Question: 2
Write down the glasses prescription for this patient
(using negative cylinder) = 5
7/14/2014 5anjumk38dmc@gmail.com
Answer
• the power of the cylinder is 900 to the axis
• 2/3 meter is equivalent to -1.50 which has to
be taken off)
7/14/2014 6anjumk38dmc@gmail.com
Answer
•
7/14/2014 7anjumk38dmc@gmail.com
• OD = -1.00 Dsph/-1.50 Dcyl 90
• OS = -0.50 Dsph/-1.50 Dcyl 120
7/14/2014 8anjumk38dmc@gmail.com
OSPE:2
7/14/2014 9anjumk38dmc@gmail.com
Question
Calculate the spherical equivalent of the
following prescriptions and draw the
power cross for each.
a. +2.50 / -1.50 X 80
b. -4.00 / + 6.00 X 90
c. +1.50 / -3.50 X 45
7/14/2014 10anjumk38dmc@gmail.com
Answer
7/14/2014 11anjumk38dmc@gmail.com
Answer
a. +2.50 / -1.50 X 80 = +1.75 (spherical
equivalent)
b. -4.00 / + 6.00 X 90 = -1.00 (spherical
equivalent)
c. +1.50 / -3.50 X 45 = -0.25 (spherical
equivalent)
• To draw the power cross remember that the power
of the cylinder is 90 degrees to the axis.
The spherical equivalent is calculated by adding
the value of the sphere and half the value of the
cylinder.)
7/14/2014 12anjumk38dmc@gmail.com
OSPE:3
7/14/2014 13anjumk38dmc@gmail.com
Convert them into spectacle forms with
minus cylinder notation
• Working distance is 67 cm
7/14/2014 14anjumk38dmc@gmail.com
1) The power crosses translate to
spherocylindrical corrections (with minus
cylinder) of
RE +1.50 / - 4.00 X 135
LE -0.75 / -1.25 X 90
• As the working distance is 2/3 meter, -1.50
D is subtracted from the above giving
RE PL / -4.00 X 135
LE -2.25 / -1.25 X 90
7/14/2014 15anjumk38dmc@gmail.com
2) The power crosses translate to
spherocylindrical corrections (with positive
cylinder) of
RE -2.50 / +4.00 X 45
LE -2.00 / +1.25 X 180
• As the working distance is now 1/2 meter, -
2.00D is subtracted from the above
RE -4.50 / +4.00 X 45
LE -4.00 / +1.25 X 180
7/14/2014 16anjumk38dmc@gmail.com
OSPE:4
7/14/2014 17anjumk38dmc@gmail.com
Question
A 18 year-old university student presents to the
optician one week before his final examination
complaining of intermittent double vision and
poor distance vision. He was seen one month
earlier and the refraction was emmetropic.
Q: 1 What is the most likely diagnosis?
Q: 2 What treatment would you prescribe?
7/14/2014 18anjumk38dmc@gmail.com
Question
A 40 year-old myopic woman is recently prescribed soft
contact lenses for the first time. She returned two
weeks later and complains that her reading vision is
not as good as with her glasses. Retest shows her
visual acuity to be 6/6 in both eyes with the contact
lenses and the lenses were of the right prescription
and well-fitted.
Q: 3 Why does she have problem reading with her
contact lenses but not with her glasses?
7/14/2014 19anjumk38dmc@gmail.com
Answer
Ans: 1 Accommodation spasm. (When the symptoms occurs the
patient is likely to have constricted pupils and esotropia. The
spasm can be broken with cyloplegia.)
Ans: 2 The following treatment is useful:
Frequent looking up from work or
Prescription of reading glasses
Ans: 3.The patient is pre-presbyopic. Myopes require less
accommodation with glasses than contact lenses. In addition,
the prismatic effect (base-in prism) offered by the
concave glasses assist convergence during reading.
•
7/14/2014 20anjumk38dmc@gmail.com
OSPE:5
7/14/2014 21anjumk38dmc@gmail.com
Question
A 15 year-old emmetropic boy has an amplitude of
accommodation is 30 D.
Q: 1. What is his range of accommodation?
Another 20 year-old man has a +10 D hypermetropia
with 20 D amplitude of accommodation.
Q: 2. What is his near point and the range of
accommodation when he is not wearing the spectacle
correction?
Q:3 What is his near point and the range of
accommodation when he is wearing his +10.00
dioptres?7/14/2014 22anjumk38dmc@gmail.com
Answer
Answer: 1 Infinity to 3.3cm. =3
(The range of accommodation is the linear distance
between the far point and the near point. In the
absence of accommodation, the boy is in focus at
infinity. With maximal accommodation, he is in focus
at 1/30 = 0.033m = 3.3cm)
Answer:2. 10cm = 3
(To be in focus in infinity, the man needs to use up
+10.00D of his accommodation amplitude. As a
result, he has only 20 - 10 = 10 D for near vision. His
near point is 1/10 = 0.10 m = 10 cm)
7/14/2014 23anjumk38dmc@gmail.com
Answer
Answer: 3. The near point is 5 cm and the range of
accommodation is infinity to 5 cm.
= 4
(With hypermetropic correction he does not need to use up any
of his accommodation and can therefore use all the 20 D for
near vision. The near point is therefore 1/20 = 0.05m = 5cm.
The range of accommodation is therefore from infinity to 5
cm)
7/14/2014 24anjumk38dmc@gmail.com
OSPE:6
7/14/2014 25anjumk38dmc@gmail.com
This is a concave mirror, 5 objects are placed in 5
different location,
Q:1 Write down the location of the images.
Q: Write down where it will be real and virtual
7/14/2014 26anjumk38dmc@gmail.com
Answer
• Case 1: Between C and F. REAL IMAGE
• Case 2: Image will be at C. REAL IMAGE
• Case 3: Image will be beyond C. REAL
IMAGE
• Case 4: No image will be form
• Case 5: the image will always be located
somewhere on the opposite side of the mirror.
• VIRTUAL IMAGE
7/14/2014 27anjumk38dmc@gmail.com

Weitere ähnliche Inhalte

Was ist angesagt?

Was ist angesagt? (20)

Anisometropia
AnisometropiaAnisometropia
Anisometropia
 
Ospe of eye
Ospe of eyeOspe of eye
Ospe of eye
 
Objective refraction
Objective refractionObjective refraction
Objective refraction
 
Fundus examination
Fundus examinationFundus examination
Fundus examination
 
Trial set
Trial setTrial set
Trial set
 
Worth 4 dot test
Worth 4 dot testWorth 4 dot test
Worth 4 dot test
 
Examination of a case of squint
Examination of a case of squintExamination of a case of squint
Examination of a case of squint
 
Real prism use in ophthalmology
Real prism use in ophthalmologyReal prism use in ophthalmology
Real prism use in ophthalmology
 
Forced duction test
Forced duction test Forced duction test
Forced duction test
 
Slit Lamp Biomicroscopy
Slit  Lamp BiomicroscopySlit  Lamp Biomicroscopy
Slit Lamp Biomicroscopy
 
Simple & Toric Transposition
Simple & Toric TranspositionSimple & Toric Transposition
Simple & Toric Transposition
 
Synoptophore
SynoptophoreSynoptophore
Synoptophore
 
Case presentation
Case presentation   Case presentation
Case presentation
 
Hess chart
Hess chartHess chart
Hess chart
 
Case presentation-Retinitis Pigmentosa Albecanse
Case presentation-Retinitis Pigmentosa AlbecanseCase presentation-Retinitis Pigmentosa Albecanse
Case presentation-Retinitis Pigmentosa Albecanse
 
Spherical, cylindrical and toric lenses
Spherical, cylindrical and toric lensesSpherical, cylindrical and toric lenses
Spherical, cylindrical and toric lenses
 
Amblyopia adio 2020
Amblyopia adio 2020Amblyopia adio 2020
Amblyopia adio 2020
 
Hvid
Hvid Hvid
Hvid
 
Hess chart and it's Interpretation
Hess chart and it's InterpretationHess chart and it's Interpretation
Hess chart and it's Interpretation
 
Case presentation 2 : Duane's Syndrome
Case presentation 2 : Duane's Syndrome Case presentation 2 : Duane's Syndrome
Case presentation 2 : Duane's Syndrome
 

Ähnlich wie Objective structured practical question (ospe)

Objective structured practical question (ospe)
Objective structured practical question (ospe)Objective structured practical question (ospe)
Objective structured practical question (ospe)Anisur Rahman
 
Objective structured practical question (ospe)
Objective structured practical question (ospe)Objective structured practical question (ospe)
Objective structured practical question (ospe)Anisur Rahman
 
Self-assessment in optic and refraction by prof Chua, dr. Chieng, dr.ngo and ...
Self-assessment in optic and refraction by prof Chua, dr. Chieng, dr.ngo and ...Self-assessment in optic and refraction by prof Chua, dr. Chieng, dr.ngo and ...
Self-assessment in optic and refraction by prof Chua, dr. Chieng, dr.ngo and ...Mero Eye
 
Objective structured practical question (ospe) for FCPS MS amd DO examinee of...
Objective structured practical question (ospe) for FCPS MS amd DO examinee of...Objective structured practical question (ospe) for FCPS MS amd DO examinee of...
Objective structured practical question (ospe) for FCPS MS amd DO examinee of...Anisur Rahman
 
Spectacle prescription
Spectacle prescriptionSpectacle prescription
Spectacle prescriptionRicha Naik
 
Glasses prescription clinical tips.pptx
Glasses prescription clinical tips.pptxGlasses prescription clinical tips.pptx
Glasses prescription clinical tips.pptxMohamed Elkadim
 
Maddox rod and double maddox rod
Maddox rod and double maddox rodMaddox rod and double maddox rod
Maddox rod and double maddox rodAnuMusyakhwo7
 
Ophthalmic Prisms: Prismatic Effects and Decentration
Ophthalmic Prisms: Prismatic Effects and DecentrationOphthalmic Prisms: Prismatic Effects and Decentration
Ophthalmic Prisms: Prismatic Effects and DecentrationRabindraAdhikary
 
PRESBYOPIA the presentation ophthalmology
PRESBYOPIA the presentation ophthalmologyPRESBYOPIA the presentation ophthalmology
PRESBYOPIA the presentation ophthalmologykadayathsandeep
 
lensesinophthalmology-171212163049 (1).pdf
lensesinophthalmology-171212163049 (1).pdflensesinophthalmology-171212163049 (1).pdf
lensesinophthalmology-171212163049 (1).pdfDrSunandaMajumder
 
Lenses in ophthalmology
Lenses in ophthalmologyLenses in ophthalmology
Lenses in ophthalmologyReshma Peter
 
combination of lanses
combination of lansescombination of lanses
combination of lansessahi9
 
Reflection refraction
Reflection   refractionReflection   refraction
Reflection refractionsanjeev saini
 
OSPE (Ophthalmology) for FCPS, FRCOphth, MS & DO Examinee.
OSPE (Ophthalmology) for FCPS, FRCOphth, MS & DO Examinee.OSPE (Ophthalmology) for FCPS, FRCOphth, MS & DO Examinee.
OSPE (Ophthalmology) for FCPS, FRCOphth, MS & DO Examinee.Anisur Rahman
 
Ospe (objective structured practical examination)
Ospe (objective structured practical examination)Ospe (objective structured practical examination)
Ospe (objective structured practical examination)Anisur Rahman
 
Detailedlessonplan 141011085254-conversion-gate02
Detailedlessonplan 141011085254-conversion-gate02Detailedlessonplan 141011085254-conversion-gate02
Detailedlessonplan 141011085254-conversion-gate02Dau Almera Kadil
 
Physics Investagatory Project
Physics Investagatory ProjectPhysics Investagatory Project
Physics Investagatory ProjectVikash Prasad
 

Ähnlich wie Objective structured practical question (ospe) (20)

Objective structured practical question (ospe)
Objective structured practical question (ospe)Objective structured practical question (ospe)
Objective structured practical question (ospe)
 
Objective structured practical question (ospe)
Objective structured practical question (ospe)Objective structured practical question (ospe)
Objective structured practical question (ospe)
 
Troubleshooting bifocals
Troubleshooting bifocals Troubleshooting bifocals
Troubleshooting bifocals
 
Self-assessment in optic and refraction by prof Chua, dr. Chieng, dr.ngo and ...
Self-assessment in optic and refraction by prof Chua, dr. Chieng, dr.ngo and ...Self-assessment in optic and refraction by prof Chua, dr. Chieng, dr.ngo and ...
Self-assessment in optic and refraction by prof Chua, dr. Chieng, dr.ngo and ...
 
Objective structured practical question (ospe) for FCPS MS amd DO examinee of...
Objective structured practical question (ospe) for FCPS MS amd DO examinee of...Objective structured practical question (ospe) for FCPS MS amd DO examinee of...
Objective structured practical question (ospe) for FCPS MS amd DO examinee of...
 
Spectacle prescription
Spectacle prescriptionSpectacle prescription
Spectacle prescription
 
Glasses prescription clinical tips.pptx
Glasses prescription clinical tips.pptxGlasses prescription clinical tips.pptx
Glasses prescription clinical tips.pptx
 
Maddox rod and double maddox rod
Maddox rod and double maddox rodMaddox rod and double maddox rod
Maddox rod and double maddox rod
 
Ophthalmic Prisms: Prismatic Effects and Decentration
Ophthalmic Prisms: Prismatic Effects and DecentrationOphthalmic Prisms: Prismatic Effects and Decentration
Ophthalmic Prisms: Prismatic Effects and Decentration
 
PRESBYOPIA the presentation ophthalmology
PRESBYOPIA the presentation ophthalmologyPRESBYOPIA the presentation ophthalmology
PRESBYOPIA the presentation ophthalmology
 
lensesinophthalmology-171212163049 (1).pdf
lensesinophthalmology-171212163049 (1).pdflensesinophthalmology-171212163049 (1).pdf
lensesinophthalmology-171212163049 (1).pdf
 
Lenses in ophthalmology
Lenses in ophthalmologyLenses in ophthalmology
Lenses in ophthalmology
 
For slide share
For slide shareFor slide share
For slide share
 
combination of lanses
combination of lansescombination of lanses
combination of lanses
 
Reflection refraction
Reflection   refractionReflection   refraction
Reflection refraction
 
OSPE (Ophthalmology) for FCPS, FRCOphth, MS & DO Examinee.
OSPE (Ophthalmology) for FCPS, FRCOphth, MS & DO Examinee.OSPE (Ophthalmology) for FCPS, FRCOphth, MS & DO Examinee.
OSPE (Ophthalmology) for FCPS, FRCOphth, MS & DO Examinee.
 
Ospe (objective structured practical examination)
Ospe (objective structured practical examination)Ospe (objective structured practical examination)
Ospe (objective structured practical examination)
 
Detailedlessonplan 141011085254-conversion-gate02
Detailedlessonplan 141011085254-conversion-gate02Detailedlessonplan 141011085254-conversion-gate02
Detailedlessonplan 141011085254-conversion-gate02
 
Physics Investagatory Project
Physics Investagatory ProjectPhysics Investagatory Project
Physics Investagatory Project
 
April 5-2013-vrics
April 5-2013-vricsApril 5-2013-vrics
April 5-2013-vrics
 

Mehr von Anisur Rahman

Hypertensive retinopathy
Hypertensive retinopathyHypertensive retinopathy
Hypertensive retinopathyAnisur Rahman
 
Goldman Applanation Tonometer
Goldman Applanation TonometerGoldman Applanation Tonometer
Goldman Applanation TonometerAnisur Rahman
 
Central tendency and dispersion
Central tendency and dispersionCentral tendency and dispersion
Central tendency and dispersionAnisur Rahman
 
Ophthalmoscope direct and indirect
Ophthalmoscope direct and indirectOphthalmoscope direct and indirect
Ophthalmoscope direct and indirectAnisur Rahman
 
04 lecture Neuro-ophthalmology
04 lecture Neuro-ophthalmology04 lecture Neuro-ophthalmology
04 lecture Neuro-ophthalmologyAnisur Rahman
 
5th lecture on research methodology
5th lecture on research methodology5th lecture on research methodology
5th lecture on research methodologyAnisur Rahman
 
Second lecture neuro ophthalmology
Second lecture neuro ophthalmologySecond lecture neuro ophthalmology
Second lecture neuro ophthalmologyAnisur Rahman
 
Sample and Sampling Technique 3rd Lecture
Sample and Sampling Technique 3rd LectureSample and Sampling Technique 3rd Lecture
Sample and Sampling Technique 3rd LectureAnisur Rahman
 
Optics 09 april 2021
Optics 09 april 2021Optics 09 april 2021
Optics 09 april 2021Anisur Rahman
 

Mehr von Anisur Rahman (20)

Hypertensive retinopathy
Hypertensive retinopathyHypertensive retinopathy
Hypertensive retinopathy
 
LASER
LASERLASER
LASER
 
Goldman Applanation Tonometer
Goldman Applanation TonometerGoldman Applanation Tonometer
Goldman Applanation Tonometer
 
Neuro-ophthalmology
Neuro-ophthalmologyNeuro-ophthalmology
Neuro-ophthalmology
 
Central tendency and dispersion
Central tendency and dispersionCentral tendency and dispersion
Central tendency and dispersion
 
Ophthalmoscope direct and indirect
Ophthalmoscope direct and indirectOphthalmoscope direct and indirect
Ophthalmoscope direct and indirect
 
Neuro ophthalmology
Neuro ophthalmologyNeuro ophthalmology
Neuro ophthalmology
 
Refractive error
Refractive error Refractive error
Refractive error
 
04 lecture Neuro-ophthalmology
04 lecture Neuro-ophthalmology04 lecture Neuro-ophthalmology
04 lecture Neuro-ophthalmology
 
04 prism
04 prism 04 prism
04 prism
 
06 lecture
06 lecture06 lecture
06 lecture
 
03 mirror and lens
03 mirror and lens03 mirror and lens
03 mirror and lens
 
03 lecture neuro
03 lecture neuro03 lecture neuro
03 lecture neuro
 
5th lecture on research methodology
5th lecture on research methodology5th lecture on research methodology
5th lecture on research methodology
 
02 lecture 16 april
02 lecture 16 april02 lecture 16 april
02 lecture 16 april
 
Second lecture neuro ophthalmology
Second lecture neuro ophthalmologySecond lecture neuro ophthalmology
Second lecture neuro ophthalmology
 
Sample and Sampling Technique 3rd Lecture
Sample and Sampling Technique 3rd LectureSample and Sampling Technique 3rd Lecture
Sample and Sampling Technique 3rd Lecture
 
Optics 09 april 2021
Optics 09 april 2021Optics 09 april 2021
Optics 09 april 2021
 
0 protocol
0 protocol 0 protocol
0 protocol
 
Ospe mbbs
Ospe mbbsOspe mbbs
Ospe mbbs
 

Kürzlich hochgeladen

Female Reproductive Physiology Before Pregnancy
Female Reproductive Physiology Before PregnancyFemale Reproductive Physiology Before Pregnancy
Female Reproductive Physiology Before PregnancyMedicoseAcademics
 
AORTIC DISSECTION and management of aortic dissection
AORTIC DISSECTION and management of aortic dissectionAORTIC DISSECTION and management of aortic dissection
AORTIC DISSECTION and management of aortic dissectiondrhanifmohdali
 
Role of Soap based and synthetic or syndets bar
Role of  Soap based and synthetic or syndets barRole of  Soap based and synthetic or syndets bar
Role of Soap based and synthetic or syndets barmohitRahangdale
 
ANATOMICAL FAETURES OF BONES FOR NURSING STUDENTS .pptx
ANATOMICAL FAETURES OF BONES  FOR NURSING STUDENTS .pptxANATOMICAL FAETURES OF BONES  FOR NURSING STUDENTS .pptx
ANATOMICAL FAETURES OF BONES FOR NURSING STUDENTS .pptxWINCY THIRUMURUGAN
 
ORAL HYPOGLYCAEMIC AGENTS - PART 2.pptx
ORAL HYPOGLYCAEMIC AGENTS  - PART 2.pptxORAL HYPOGLYCAEMIC AGENTS  - PART 2.pptx
ORAL HYPOGLYCAEMIC AGENTS - PART 2.pptxNIKITA BHUTE
 
Physiology of Smooth Muscles -Mechanics of contraction and relaxation
Physiology of Smooth Muscles -Mechanics of contraction and relaxationPhysiology of Smooth Muscles -Mechanics of contraction and relaxation
Physiology of Smooth Muscles -Mechanics of contraction and relaxationMedicoseAcademics
 
Adenomyosis or Fibroid- making right diagnosis
Adenomyosis or Fibroid- making right diagnosisAdenomyosis or Fibroid- making right diagnosis
Adenomyosis or Fibroid- making right diagnosisSujoy Dasgupta
 
Red Blood Cells_anemia & polycythemia.pdf
Red Blood Cells_anemia & polycythemia.pdfRed Blood Cells_anemia & polycythemia.pdf
Red Blood Cells_anemia & polycythemia.pdfMedicoseAcademics
 
PAIN/CLASSIFICATION AND MANAGEMENT OF PAIN.pdf
PAIN/CLASSIFICATION AND MANAGEMENT OF PAIN.pdfPAIN/CLASSIFICATION AND MANAGEMENT OF PAIN.pdf
PAIN/CLASSIFICATION AND MANAGEMENT OF PAIN.pdfDolisha Warbi
 
"Radical excision of DIE in subferile women with deep infiltrating endometrio...
"Radical excision of DIE in subferile women with deep infiltrating endometrio..."Radical excision of DIE in subferile women with deep infiltrating endometrio...
"Radical excision of DIE in subferile women with deep infiltrating endometrio...Sujoy Dasgupta
 
CPR.nursingoutlook.pdf , Bsc nursing student
CPR.nursingoutlook.pdf , Bsc nursing studentCPR.nursingoutlook.pdf , Bsc nursing student
CPR.nursingoutlook.pdf , Bsc nursing studentsaileshpanda05
 
Male Infertility, Antioxidants and Beyond
Male Infertility, Antioxidants and BeyondMale Infertility, Antioxidants and Beyond
Male Infertility, Antioxidants and BeyondSujoy Dasgupta
 
historyofpsychiatryinindia. Senthil Thirusangu
historyofpsychiatryinindia. Senthil Thirusanguhistoryofpsychiatryinindia. Senthil Thirusangu
historyofpsychiatryinindia. Senthil Thirusangu Medical University
 
FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...
FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...
FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...Shubhanshu Gaurav
 
power point presentation of Clinical evaluation of strabismus
power point presentation of Clinical evaluation  of strabismuspower point presentation of Clinical evaluation  of strabismus
power point presentation of Clinical evaluation of strabismusChandrasekar Reddy
 
SGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdf
SGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdfSGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdf
SGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdfHongBiThi1
 
Trustworthiness of AI based predictions Aachen 2024
Trustworthiness of AI based predictions Aachen 2024Trustworthiness of AI based predictions Aachen 2024
Trustworthiness of AI based predictions Aachen 2024EwoutSteyerberg1
 
BENIGN BREAST DISEASE
BENIGN BREAST DISEASE BENIGN BREAST DISEASE
BENIGN BREAST DISEASE Mamatha Lakka
 

Kürzlich hochgeladen (20)

Female Reproductive Physiology Before Pregnancy
Female Reproductive Physiology Before PregnancyFemale Reproductive Physiology Before Pregnancy
Female Reproductive Physiology Before Pregnancy
 
AORTIC DISSECTION and management of aortic dissection
AORTIC DISSECTION and management of aortic dissectionAORTIC DISSECTION and management of aortic dissection
AORTIC DISSECTION and management of aortic dissection
 
Role of Soap based and synthetic or syndets bar
Role of  Soap based and synthetic or syndets barRole of  Soap based and synthetic or syndets bar
Role of Soap based and synthetic or syndets bar
 
Immune labs basics part 1 acute phase reactants ESR, CRP Ahmed Yehia Ismaeel,...
Immune labs basics part 1 acute phase reactants ESR, CRP Ahmed Yehia Ismaeel,...Immune labs basics part 1 acute phase reactants ESR, CRP Ahmed Yehia Ismaeel,...
Immune labs basics part 1 acute phase reactants ESR, CRP Ahmed Yehia Ismaeel,...
 
ANATOMICAL FAETURES OF BONES FOR NURSING STUDENTS .pptx
ANATOMICAL FAETURES OF BONES  FOR NURSING STUDENTS .pptxANATOMICAL FAETURES OF BONES  FOR NURSING STUDENTS .pptx
ANATOMICAL FAETURES OF BONES FOR NURSING STUDENTS .pptx
 
ORAL HYPOGLYCAEMIC AGENTS - PART 2.pptx
ORAL HYPOGLYCAEMIC AGENTS  - PART 2.pptxORAL HYPOGLYCAEMIC AGENTS  - PART 2.pptx
ORAL HYPOGLYCAEMIC AGENTS - PART 2.pptx
 
How to master Steroid (glucocorticoids) prescription, different scenarios, ca...
How to master Steroid (glucocorticoids) prescription, different scenarios, ca...How to master Steroid (glucocorticoids) prescription, different scenarios, ca...
How to master Steroid (glucocorticoids) prescription, different scenarios, ca...
 
Physiology of Smooth Muscles -Mechanics of contraction and relaxation
Physiology of Smooth Muscles -Mechanics of contraction and relaxationPhysiology of Smooth Muscles -Mechanics of contraction and relaxation
Physiology of Smooth Muscles -Mechanics of contraction and relaxation
 
Adenomyosis or Fibroid- making right diagnosis
Adenomyosis or Fibroid- making right diagnosisAdenomyosis or Fibroid- making right diagnosis
Adenomyosis or Fibroid- making right diagnosis
 
Red Blood Cells_anemia & polycythemia.pdf
Red Blood Cells_anemia & polycythemia.pdfRed Blood Cells_anemia & polycythemia.pdf
Red Blood Cells_anemia & polycythemia.pdf
 
PAIN/CLASSIFICATION AND MANAGEMENT OF PAIN.pdf
PAIN/CLASSIFICATION AND MANAGEMENT OF PAIN.pdfPAIN/CLASSIFICATION AND MANAGEMENT OF PAIN.pdf
PAIN/CLASSIFICATION AND MANAGEMENT OF PAIN.pdf
 
"Radical excision of DIE in subferile women with deep infiltrating endometrio...
"Radical excision of DIE in subferile women with deep infiltrating endometrio..."Radical excision of DIE in subferile women with deep infiltrating endometrio...
"Radical excision of DIE in subferile women with deep infiltrating endometrio...
 
CPR.nursingoutlook.pdf , Bsc nursing student
CPR.nursingoutlook.pdf , Bsc nursing studentCPR.nursingoutlook.pdf , Bsc nursing student
CPR.nursingoutlook.pdf , Bsc nursing student
 
Male Infertility, Antioxidants and Beyond
Male Infertility, Antioxidants and BeyondMale Infertility, Antioxidants and Beyond
Male Infertility, Antioxidants and Beyond
 
historyofpsychiatryinindia. Senthil Thirusangu
historyofpsychiatryinindia. Senthil Thirusanguhistoryofpsychiatryinindia. Senthil Thirusangu
historyofpsychiatryinindia. Senthil Thirusangu
 
FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...
FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...
FDMA FLAP - The first dorsal metacarpal artery (FDMA) flap is used mainly for...
 
power point presentation of Clinical evaluation of strabismus
power point presentation of Clinical evaluation  of strabismuspower point presentation of Clinical evaluation  of strabismus
power point presentation of Clinical evaluation of strabismus
 
SGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdf
SGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdfSGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdf
SGK RỐI LOẠN KALI MÁU CỰC KỲ QUAN TRỌNG.pdf
 
Trustworthiness of AI based predictions Aachen 2024
Trustworthiness of AI based predictions Aachen 2024Trustworthiness of AI based predictions Aachen 2024
Trustworthiness of AI based predictions Aachen 2024
 
BENIGN BREAST DISEASE
BENIGN BREAST DISEASE BENIGN BREAST DISEASE
BENIGN BREAST DISEASE
 

Objective structured practical question (ospe)

  • 1. Objective Structured Practical Question (OSPE) Topic: Optics According to the course curriculum of Bangladesh College of Physician & Surgeon (BCPS)
  • 2. AUTHOR: Dr Md Anisur Rahman Anjum. MBBS (Dhaka Medical College). DO (Dhaka University) FCPS (EYE) Associate Professor National Institute of Ophthalmology Dhaka, Bangladesh. Chamber: Mojibunnessa Eye Hospital House: 18 Road: 6. Dhanmondi, Dhaka, 1205. Bangladesh. Email: anjumk38dmc@gmail.com Cell: 01711-832397 7/14/2014 2anjumk38dmc@gmail.com
  • 4. Question The following are the results of the retinoscopy on a 20 year-old man using a streak retinoscope.(Assuming a working distance of 2/3 metre) OD With the streak in the vertical meridian and sweep horizontally, the retina reflex is neutralized with +0.50D. With the streak in the horizontal meridian and sweep vertically, the retina reflex is neutralized with -1.00D. 7/14/2014 4anjumk38dmc@gmail.com
  • 5. Question  OS With the streak orientated at 30o and sweep at 120o, the retina reflex is neutralized with +1.00D. With the streak orientated at 120o and sweep at 30o, the retina reflex is neutralized with -0.50D Question: 1 Draw the power cross (taking into account the working distance). = 5 Question: 2 Write down the glasses prescription for this patient (using negative cylinder) = 5 7/14/2014 5anjumk38dmc@gmail.com
  • 6. Answer • the power of the cylinder is 900 to the axis • 2/3 meter is equivalent to -1.50 which has to be taken off) 7/14/2014 6anjumk38dmc@gmail.com
  • 8. • OD = -1.00 Dsph/-1.50 Dcyl 90 • OS = -0.50 Dsph/-1.50 Dcyl 120 7/14/2014 8anjumk38dmc@gmail.com
  • 10. Question Calculate the spherical equivalent of the following prescriptions and draw the power cross for each. a. +2.50 / -1.50 X 80 b. -4.00 / + 6.00 X 90 c. +1.50 / -3.50 X 45 7/14/2014 10anjumk38dmc@gmail.com
  • 12. Answer a. +2.50 / -1.50 X 80 = +1.75 (spherical equivalent) b. -4.00 / + 6.00 X 90 = -1.00 (spherical equivalent) c. +1.50 / -3.50 X 45 = -0.25 (spherical equivalent) • To draw the power cross remember that the power of the cylinder is 90 degrees to the axis. The spherical equivalent is calculated by adding the value of the sphere and half the value of the cylinder.) 7/14/2014 12anjumk38dmc@gmail.com
  • 14. Convert them into spectacle forms with minus cylinder notation • Working distance is 67 cm 7/14/2014 14anjumk38dmc@gmail.com
  • 15. 1) The power crosses translate to spherocylindrical corrections (with minus cylinder) of RE +1.50 / - 4.00 X 135 LE -0.75 / -1.25 X 90 • As the working distance is 2/3 meter, -1.50 D is subtracted from the above giving RE PL / -4.00 X 135 LE -2.25 / -1.25 X 90 7/14/2014 15anjumk38dmc@gmail.com
  • 16. 2) The power crosses translate to spherocylindrical corrections (with positive cylinder) of RE -2.50 / +4.00 X 45 LE -2.00 / +1.25 X 180 • As the working distance is now 1/2 meter, - 2.00D is subtracted from the above RE -4.50 / +4.00 X 45 LE -4.00 / +1.25 X 180 7/14/2014 16anjumk38dmc@gmail.com
  • 18. Question A 18 year-old university student presents to the optician one week before his final examination complaining of intermittent double vision and poor distance vision. He was seen one month earlier and the refraction was emmetropic. Q: 1 What is the most likely diagnosis? Q: 2 What treatment would you prescribe? 7/14/2014 18anjumk38dmc@gmail.com
  • 19. Question A 40 year-old myopic woman is recently prescribed soft contact lenses for the first time. She returned two weeks later and complains that her reading vision is not as good as with her glasses. Retest shows her visual acuity to be 6/6 in both eyes with the contact lenses and the lenses were of the right prescription and well-fitted. Q: 3 Why does she have problem reading with her contact lenses but not with her glasses? 7/14/2014 19anjumk38dmc@gmail.com
  • 20. Answer Ans: 1 Accommodation spasm. (When the symptoms occurs the patient is likely to have constricted pupils and esotropia. The spasm can be broken with cyloplegia.) Ans: 2 The following treatment is useful: Frequent looking up from work or Prescription of reading glasses Ans: 3.The patient is pre-presbyopic. Myopes require less accommodation with glasses than contact lenses. In addition, the prismatic effect (base-in prism) offered by the concave glasses assist convergence during reading. • 7/14/2014 20anjumk38dmc@gmail.com
  • 22. Question A 15 year-old emmetropic boy has an amplitude of accommodation is 30 D. Q: 1. What is his range of accommodation? Another 20 year-old man has a +10 D hypermetropia with 20 D amplitude of accommodation. Q: 2. What is his near point and the range of accommodation when he is not wearing the spectacle correction? Q:3 What is his near point and the range of accommodation when he is wearing his +10.00 dioptres?7/14/2014 22anjumk38dmc@gmail.com
  • 23. Answer Answer: 1 Infinity to 3.3cm. =3 (The range of accommodation is the linear distance between the far point and the near point. In the absence of accommodation, the boy is in focus at infinity. With maximal accommodation, he is in focus at 1/30 = 0.033m = 3.3cm) Answer:2. 10cm = 3 (To be in focus in infinity, the man needs to use up +10.00D of his accommodation amplitude. As a result, he has only 20 - 10 = 10 D for near vision. His near point is 1/10 = 0.10 m = 10 cm) 7/14/2014 23anjumk38dmc@gmail.com
  • 24. Answer Answer: 3. The near point is 5 cm and the range of accommodation is infinity to 5 cm. = 4 (With hypermetropic correction he does not need to use up any of his accommodation and can therefore use all the 20 D for near vision. The near point is therefore 1/20 = 0.05m = 5cm. The range of accommodation is therefore from infinity to 5 cm) 7/14/2014 24anjumk38dmc@gmail.com
  • 26. This is a concave mirror, 5 objects are placed in 5 different location, Q:1 Write down the location of the images. Q: Write down where it will be real and virtual 7/14/2014 26anjumk38dmc@gmail.com
  • 27. Answer • Case 1: Between C and F. REAL IMAGE • Case 2: Image will be at C. REAL IMAGE • Case 3: Image will be beyond C. REAL IMAGE • Case 4: No image will be form • Case 5: the image will always be located somewhere on the opposite side of the mirror. • VIRTUAL IMAGE 7/14/2014 27anjumk38dmc@gmail.com