Screening For Refractive Surgery By Prof. Michael W. Belin; Screening Parameters, 4 Maps Refractive Display; Suggested Installation Settings - OCULUS Pentacam Interpretation Manual

10 Screening for refractive surgery
by Prof. Michael W. Belin
10.1

Screening parameters, 4 Maps Refractive Display

10.1.1 Suggested installation settings

The following are my guidelines for pre-operative refractive surgery screening for keratoconus:
Use the 4 Maps Refractive Display showing anterior elevation, posterior elevation, pachymetry
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and anterior sagittal curvature. It is advisable to keep the display, scales and colors constant for
refractive screening, as this will allow for a rapid visual inspection
Pachymetry
Right-click on the scale and set Abs: normal, (300-900 μm)
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Right-click on the actual display to open the drop down menu. Turn on the following: Show Apex
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Position (1), Show Thinnest Location (2), Show Pupil Edge (6), Show Nasal/Temp (7), Show Max
Diameter 9mm (12) and Show Numeric Values (14)
Anterior elevation & posterior elevation
Right-click on the scale and set to
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"Belin intuitive" +/- 75 μm for refractive practice
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"Belin intuitive" +/- 150 μm for medical practice
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Best-fit-sphere (BFS), float, manual, BFS diameter set to 9.0 mm or 8.0 mm
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On the 9.0 mm display you should have no or minimal extrapolated data for the study to be valid
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Right-click on the display and turn on the following: Show Apex Position (1), Show Thinnest
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Location (2), Show Pupil Edge (8), Show Nasal/Temp (9), Schow Max Diameter 9mm (14) and Show
Numeric Values (15)
Sagittal curvature
Right-click on the scale and set to Abs: Normal, American Style and Diopter
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Right-click on the display and set to Show Min. Radius Pos. Front (3), Show Pupil Edge (6), Show
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Nasal/Temp (7), Schow Max Diameter 9 mm (12) and Show Numeric Values (13)
Note:
The different borderline numbers for the elevation maps depend on the BFS diameter you are using,
i.e. 9 mm or 8 mm.
10 Screening for refractive surgery
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