Multispectral Fundus Imaging with Fluidic Lens Technology

Abstract

A phoropter is used to evaluate visual acuity and diagnose wavefront errors in the human eye. To improve its speed and objectivity, this study incorporates fluidic lenses, which use a translucent membrane whose curvature is controlled by fluid pressure to adjust optical power. Three fluidic lenses are used to correct defocus and astigmatism. This dissertation presents an enhanced phoropter system integrating fundus imaging for simultaneous measurement of refractive errors and diagnosis of retinal conditions. Optical modeling across multiple wavelengths was performed to achieve a wide field of view (at least 30 degrees) with high resolution. A multispectral light source enhances the visualization of retinal features at varying depths. The optical performance of the system was assessed using various objective lens configurations. Fluidic lens parameters were optimized via ray tracing. Illumination was optimized across wavelengths to maximize efficiency, radiometric safety was verified to comply with exposure limits, and techniques were implemented to minimize corneal back-reflections.