The document describes the MS-39 topographer, which provides comprehensive corneal and anterior segment analysis through a combination of Placido disk technology and spectral domain OCT. The MS-39 allows for accurate measurement of corneal thickness, curvature, elevation, aberrations, and other metrics. It also enables tear film analysis, pupillometry, and advanced lens imaging for cataract evaluations. Overall, the document emphasizes that the MS-39 is a comprehensive device for anterior segment analysis and monitoring of conditions like keratoconus through serial exams.
5. ⢠SD-OCT: accurate corneal elevation data for the whole anterior
segment
⢠PLACIDO DISC: better results on front curvature and refractive powers
⢠Bymerging Placido and OCTdata MS-39 achieves accurate measurements
of elevations, curvatures and powers for the whole cornea
12. Based on tangential curvature
Sib
Difference in the mean tangential curvature
Between two vertical zones (back)
Sif
KERATOCONUSScreening
13. Based on elevation maps
Kvb
Kvf- highest anterior elevation point from
reference best fit toric asphere
Kvb- highest anterior elevation point from
reference best fit toric asphere
Kvf
KERATOCONUSScreening
14. Based on Corneal aberrations
BCVb
BCVf/b is calculated for different pupil sizes
and front/ back sizes
BCVf
KERATOCONUSScreening
Baiocchi Calossi Versaci
(BCV) index: BCVf, BCVb
20. ⢠change in indices
⢠Multiple visits
⢠Differential maps
⢠Change in curvature/ pachymetry
⢠over visits or following treatment
21.
22.
23.
24. ⢠Spectral Domain OCT
⢠25 meridians
⢠16 mm area
⢠Anterior Chamber analysis
⢠High resolution corneal imaging
25.
26.
27. ⢠PUPILLOMETRY MODULE
⢠Pupillometry with scotopic light to
determine pupil maximum extension and
optic zone diameters for treatment setting
⢠Pupillometry with mesopic light (4 lux)
⢠Pupillometry with photopic light (50 lux)
⢠Dynamic pupillometry, starting with over
400 lux and switching off the light source so
that the pupil can dilate to its maximum
extension
⢠Evaluation of the pupil decentralization
from the corneal vertex and calculation of
the pupil centre during dilation
28. ⢠Placido disk technology allows for the advanced analysis of the tear film
such as the
⢠NI-BUT (Non Invasive Break-up time)
⢠NIF-BUT (Non Invasive First Break-up time)
⢠NIAvg-BUT (Non Invasive Average Break-up time)
⢠Useful for assessment of dry eye disorder and treatment follow up
⢠VIDEOKERATOSCOPY MODULE
⢠Tear film examination with white light
⢠Tear film examination with fluorescein
⢠Break-up time measurement
⢠Examination of tear layers
30. ďśCorneal Aberrometry
⢠OPD (Optical Path Difference)
⢠WFE (Wave Front Error)
⢠Wave front analysis of anterior and posterior corneal surface as difference
to the ideal wave front
⢠Optical analysis provides maps of refractive error WFE and OPD within the
analysis and stimulation of PSF (Point Spread Function) and MTF
(Modulation Transfer Function), useful for the ophthalmologist to explain
the visual discomfort of the patient
37. ďśRay-tracing
⢠Front and back surface of the cornea in terms on elevation and
slope
ďśAdvanced lens biometry
⢠ELED (Expected Lens Equator Distance),
⢠Lens Thickness
⢠for the most accurate calculation of IOL implant
⢠Allows to evaluate IOL details with high resolution sections
⢠Predicted Lens Position (PLP)
MS-39 does not have the axial length measurement,
ALis imported from externalsources
43. ďźGuided manual capture
ďźManagement of the patientâs data and the possibility to personalize
research and statistics
ďźMap visualization and analysis of differential maps
ďź Advanced editing system of the rings which allow to modify the position
of the edges in order to provide a proper reconstruction even on distorted
surfaces
ďźScreens and summaries which allow to personalize the device depending
on the userâs needs
ďźTools for the follow-up control with differential maps with 2 or 3 elements
A
comprehensive
device !!!
Currently there are different scheimpflug topographers using a scheimpflug alone or in combination with a placido
The MS-39 AS-OCT is the latest and the most advanced corneal map device used in the ophthalmological diagnosis to perform the analysis of the anterior segment of the eye.
In a single structure MS-39 combines corneal topography with Placidoâs disk and OCT based anterior segment tomography.
The device has been designed for the screening, the capture and the processing of 25 clear sectional images, in high resolution over a diameter of 16mm
The device provides information on pachymetry, elevation, curvature and dioptric power of both corneal surfaces over a diameter of 10 mm. All biometric measurements of the anterior chamber are calculated starting from 25 sections from the cornea over a diameter of 16mm.
MS-39 includes the advanced measurement of the epithelial and stromal layer. The epithelial masking effect is known, so knowledge of its morphology is very useful assess abnormalities of the corneal surface. Â
-KERATOCONUS SCREENING:- SIf= Symmetry Index front, KVf= Keratoconus vertex front, SIb= Symmetry Index back, KVb= Keratoconus vertex back
The deviation of corneal shape from the asphere at 6 mm or 8mm zone is described by root mean square deviation per unit area (RMS/A)
Sif and Sib describe the vertical asymmetry of the tangential curvature maps
Kvf and Kvb indices derived from elevation data, denote the maximum anterior and posterior elevation points from the reference surface
The usually altererd corneal aberration in ectasia, coma, trefoil and spherical aberrations are combined into an index for the front and the back surface BCVf and BCVb
Multiple indices of curvature, aberrations and elevation are combined by machine proprietary algorithm to give us a keratoconus summary where the final position of arrow vector suggests a class: KC, suspect or a normal
PTI= Percentage Thickness Increase
Blue line is the patient data, the blue line should follow any of the black lines
Red line is the cut off for borderline
CTSP= Corneal Thickness Spatial Profile
Blue line is the patient data, the blue line should follow any of the black lines
Red line is the cut off for borderline
INTRASTROMAL RINGS MODULE: On the basis of pachymetry map and corneal altimetric (elevation) data, MS-39 allows intrastromal ring system planning.
MS39 can measure upto 25 meridians over a 16mm area, multiple areas can be measured simultaneously or a raster scan of the section can be measured
The sharpness of the high-resolution section images on a diameter of 16 mm, together with the many details of the structure and the cornea layers brought to light by the instrument, are the most extraordinary features and appreciated by the specialists of the anterior segment (corneal and epithelial) . The device provides pachymetry, elevation, curvature and power information for both corneal surfaces.
To find the pupil size, in three different conditions
The MS39 can perform pupillography measurements under scotopic, mesopic, photopic and dynamic conditions of illumination
Without using Paracaine or Fluorescein
Take the video for 17 seconds after which the machines generates the report for the patient. This is what the reports looks like
>10- Normal
The device allows to perform the analysis of the corneal aberrometry. It is possible to select the anterior, posterior or total, corneal contribution for different diameters of the pupil.
Aberrometric analysis offers a complete overview of the corneal aberrations. It is possible to select the contribution of the anterior, posterior or total cornea for different pupil diameters. The OPD/WFE maps and the visual simulations (PSF, MTF, image convolution) can help the clinicain in understanding or explaining the patientâs visual problems.
GLAUCOMA SCREENING MODULE: For early detection of Glaucoma
The MS39 allows for the evaluation of the scleral conjunctival tissue and provides gonioscopic measurements of the anterior chamber depth and the area in between the trabecular and the surface of iris
IOL calculation module is based on ray-tracing techniques, regardless of the state of the cornea (untreated or previously treated for refractive purposes), provides the calculation of the spherical and toric power of the intraocular lens
Thus the device with the application software allows :-
