Figure 3.

Schematic drawing of the experimental eye model. A point light source (LED) of adjustable intensity and a collimator lens (not shown) were placed so that the source appeared approximately 4 m from the KPro. A Boston scleral lens that had been sand-blasted until the visual acuity of a patient looking through it was reduced to less than 20/400 was drilled to allow insertion of a type 1 KPro front plate. An adjustable iris was placed in front of the KPro. A 50-mm relay lens was placed 50 mm from the aerial image of the point source of the KPro so that the CCD camera, set for infinite focus, captured the image of the point source and the surrounding glare. The source is a 1-mm white LED, minified to approximately 3 μm at the aerial image. The type 1 KPro used was designed for an aphakic eye (focal length, 14.6 mm in air).