Partial-Field Illumination Ophthalmoscope: improving the contrast of a camera-based retinal imager

TL;DR

The paper introduces the Partial-Field Illumination Ophthalmoscope, a novel patterned illumination technique that enhances retinal image contrast by balancing field of view and signal quality, aiding clinical diagnosis.

Contribution

It presents a new patterned illumination modality integrated with adaptive optics to improve contrast in retinal imaging, adaptable for different clinical needs.

Findings

Enhanced image contrast from full-field to confocal levels.

Flexible trade-offs between contrast and acquisition speed.

Mitigation of low signal-to-noise ratio in full-field ophthalmoscopes.

Abstract

Effective and accurate in-vivo diagnosis of retinal pathologies requires high performance imaging devices, combining a large field of view and the ability to discriminate the ballistic signal from the diffuse background in order to provide a highly contrasted image of the retinal structures. Here, we have implemented the Partial-Field Illumination Ophthalmoscope, a patterned illumination modality, integrated on a high pixel rate adaptive optics full-field microscope. This non-invasive technique enables us to mitigate the low signal-to-noise ratio, intrinsic of full-field ophthalmoscopes, by partially illuminating the retina with complementary patterns to reconstruct a wide field image. This new modality provides an image contrast spanning from the full-field to the confocal contrast, depending on the pattern size. As a result, it offers various trade-offs in terms of contrast and acquisition speed, guiding the users towards the most efficient system for a particular clinical application.