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Updated: Aug 23, 2026
Scanning Light Scattering Profiler (SLPS) Based Methodology to Quantitatively Evaluate Forward and Backward Light Scattering from Intraocular Lenses
Published on: June 6, 2017
Analysis of stray-light effects related to intraocular lens edge design
Alessandro Franchini1, Barbara Zamma Gallarati, Eleonora Vaccari
1Optical Phisiophatological Department, Eye Institute, University of Florence, Viale Morgagni 85, 50134 Florence, Italy. alessandrofranchini@yahoo.it
Purpose:
To study the behavior of light rays that impact the frosted, double-square edge of an intraocular lens (IOL).
Setting:
Optical Phisiophatological Department, University of Florence, Florence, Italy.
Methods:
The interaction of light rays as a function of the edge design of a frosted, sharp-edged IOL was evaluated using an experimental eye model and an advanced ray-tracing program. The model simulates the irregularities of the frosted edge by the random overlap of sinusoidal phase gratings that have a random phase, an orientation, and a fixed period.
Results:
The reduction in the maximum intensity of the ghost image by frosting the square edge was linked to the period of the microroughness. At a maximum microroughness, when the period is less than 5 microm, the reduction in the value of an unfrosted, square-edged IOL was 17.5%.
Conclusions:
The frosted edge had a small impact on reducing the intensity of the ghost image caused by the reflection of light from the double square edge of the IOL. Furthermore, in optics, the stray light from microroughness is generally considered to be a drawback because it can decrease contrast sensitivity.
