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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

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Non-mydriatic confocal retinal imaging using a digital light projector.

Matthew S Muller¹, Jason J Green², Karthikeyan Baskaran²

¹Aeon Imaging, LLC, 501 S Madison St., Ste. 103, Bloomington, IN, USA 47403-2452.

Proceedings of Spie--The International Society for Optical Engineering

|February 16, 2016

Summary

The Digital Light Ophthalmoscope (DLO) uses a novel projection system for confocal retinal imaging. This low-cost, compact camera achieves high-contrast images with yellow light, improving patient comfort.

Keywords:

CMOS DLP Digital Light Ophthalmoscope LightCrafter confocal imaging imaging retina rolling shutter

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Area of Science:

Ophthalmology
Biomedical Engineering
Optical Imaging

Background:

Confocal retinal imaging traditionally requires complex and bulky optical setups.
Non-mydriatic retinal cameras improve patient accessibility by avoiding pupil dilation.
Existing technologies face challenges in cost, size, and patient comfort.

Purpose of the Study:

To present the technical design of the 3rd generation Digital Light Ophthalmoscope (DLO).
To demonstrate a novel approach for confocal retinal imaging using a digital light projector.
To improve image contrast and reduce patient discomfort in non-mydriatic retinal imaging.

Main Methods:

Implementation of a digital light projector as an integrated illumination and scanning element.
Rapid projection of illumination lines onto the retina to simulate scanning.
Utilizing a 2D rolling shutter CMOS sensor to capture backscattered light.
Achieving confocal imaging through temporal and spatial overlap of illumination lines and sensor readout.
Employing yellow illumination, filtered from a green LED, for enhanced blood absorption.

Main Results:

Successful implementation of a confocal non-mydriatic retinal camera (DLO) with a compact design.
Demonstration of high-contrast retinal imaging using yellow illumination.
Reduction in patient discomfort due to less pupil constriction.
The 3rd generation DLO utilizes a DLP LightCrafter 4500 and USB3.0 CMOS sensor.

Conclusions:

The DLO offers a low-cost, flexible, and robust solution for retinal imaging.
The use of yellow light enhances image quality and patient experience.
This technology represents a significant advancement in accessible ophthalmic imaging.