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1. Advancement in Low Vision Aids
S. M. Abdullah Al Mamun
M. Optom, B. Optom

2. Low vision
• Low vision - the best corrected visual acuity in the better eye less
than 6/18 and/or visual field less than 20 degree from the point of
fixation.
• Blindness – the best corrected visual acuity in the better eye less
than 3/60 and/or visual field less than 10 degree from the point of
fixation.

3. Difficulties dealt…
• Inability to recognize distance objects and faces
•Watching TV
•Seeing black board (for students)
• Problems writing/ completing paperwork
•Computer tasks / Mobile tasks
• Difficulty in mobility and navigation
•Glare problems

4. Most common conditions seen in the clinic
• Congenital cataract / Aphakia
• Retinitis Pigmentosa
• Albinism
• Diabetic retinopathy
• Age related macular degeneration
• Heredomacular degeneration (eg: Stargardt’s disease)
• Glaucoma
• Nystagmus
• Optic nerve problems (eg: Optic atrophy)

5. Low Vision Assessment
•History
•Visual Acuity
•Refraction
•Contrast Sensitivity
•Color Vision
•Visual Field
•Additional test(Cover test,
EOM etc)

6. Low vision devices
• LVD enable people with LV to join in their everyday activities
• Assist in promoting independent living
• LVDs enhance residual visual function
• There are two main types of low vision devices used for low
vision people:
• Optical devices
• Non-optical devices

7. Optical Devices

8. Optical Devices
Distance Near Field enhancer
• Spectacle and Contact
lens
• Telescopes
• Spectacle magnifiers
• Stand magnifiers
• Hand held magnifiers
• Tele microscopes
• Electronic assistive
devices-CCTV
• Semi reflective
mirror
• Fresnel Prisms
• Field expanding
channel lens
• Reverse Telescope
• Amorphic or new
horizontal lens
• Image Minifiers
• Concave lenses
• Convex mirror

9. Available distance optical devices
Telescope
SEE TV (Spectacle model
telescope)
Spectacle mounted

10. Near optical devices
Hand held magnifiers Stand magnifiers
Spectacle magnifiers

11. Telemicroscopes
Dome magnifiers
Bar magnifiers
Pocket magnifier

12. • Portable Video magnifier
• Mouse Model CCTV
• Desktop CCTV
• Smartphones and tablets
Available Assistive devices

13. Recent advancement…..
• Distance
• Bioptic telescope
• Autofocus
• Telescopic contact lenses
• Near
• MaxPort Magnifier
• Flipper Port Magnifier
• Head-mounted display

14. MaxPort Magnifier with eyeglasses
as display unit
Flipper Port Magnifier
for distant viewing

15. Head-mounted

16. Field enhancement techniques
Semi reflective mirror
Field Expanding channel lens
Reverse Telescope

17. Non optical Devices

18. Non optical devices
• Relative size and larger assistive devices.
• Glare, contrast and lighting control devices.
• Posture and comfort maintenance devices.
• Handwriting and written communication devices.
• Medical management devices.
• O & M management techniques and devices.
• Sensory substitution devices.

19. Playing Cards
Large Button Dial Phone
Relative size and larger assistive devices
Large print
calculator

20. NOIR & CPF – (Corning Photochromatic Filter)
Glare, contrast and light control
Typoscopes

21. Adequate light ( natural / lamp) for
daily tasks

22. Environmental modification Painted edges of Staircase
Color and contrast

23. Contrast in Kitchen

24. Posture and comfort maintenance
Telescope attached with Headband
Reading Stand

25. Hand writing and written
communication
Signature guide,Check guides,Reading guide
Bold line paper
Bold felt-tip pens

26. O & M management
Sighted guide
Laser cane
Miniguide

27. Syringe with magnifiers
Talking sphygmomanometers
Voice talking Glucometer
Medical management

28. Sensory-substitution devices
Braille writer Braille Embosser & Printer

29. Basic cells of Braille
Perkin’s Brailler

30. • Visual enhancement Techniques:
• Head Scanning
• Eccentric viewing
• Visual tracking skills

31. Others for DLS
• Concave mirror- shaving
• Needle threader
• Flash torch light
• Buttons of different colors
• Notex – notes identifier
• Different size of currencies- by tactile / grouping
• Umbrella

32. Recent advancement …..
• O & M management devices:
• Wheelchair pathfinder
• Guide Cane
• BAT ‘K’ Cane Handle
• Infrared Sensor
• Color & contrast: Talking Color Detector
• Reading software:
• Poet Compact
• JAWS and NVDA
• Kurzweil education

33. • Magnification software:
• ZoomText
• Magic 8.0
• Virtual assistants:
• Amazon Alexa
• Apple Siri
• Android's Google Assistant

34. Poet Compact - Reader Magic 8.0

35. Talking Color Detector

36. Referral section
Blind school and Rehabilitation center:
 Orientation and Mobility Training
 Vocational training
 Adjustment training (Daily living skills)
Child development center and Rehabilitation center:
Early Intervention for children with Multiple
disabilities
Special schooling: for Multiple disabilities children
Social Welfare Department: Disability certificate