Archive for the ‘Corneal Grafts’ Category
Double Offset Zone Contact lens fit 12/03/2009
January 12th, 2010 | 
Author: Patient presented with highly irregular corneal graft. Inferior region has two distinct areas of protrusion and can be seen in topography images 1 & 2.
Image 1
Image 2
Prior to visiting our facility, multiple attempts had been made to fit this eye with base toric lenses. All of which failed to achieve an acceptable fit.
Although topography readings are achievable, they fall short of complete accuracy of curvature.
Our initial design featured the following parameters:
Primary Base Curve Radius = 6.20
Two offset zones, each 2mm from inferior center with Radii of 5.40 and a diameter of 4mm.
Lens Power = -9.25
Overall lens diameter = 9.2mm
This lens produced a 20/30 visual acuity and the fluorescein pattern is featured in image #3. Although this is not a good fit it helped us quickly determine parameter changes for a much improved fit.
Image 3
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