Toward the development of a low-cost laser Doppler module for ophthalmic microscopes

Stefano Cattini; Luigi Rovati

doi:10.1117/12.908108

9 March 2012 Toward the development of a low-cost laser Doppler module for ophthalmic microscopes

Stefano Cattini, Luigi Rovati

Proceedings Volume 8209, Ophthalmic Technologies XXII; 82091V (2012) https://doi.org/10.1117/12.908108
Event: SPIE BiOS, 2012, San Francisco, California, United States

Abstract

A laser Doppler module easily integrated into a commercial ophthalmic microscope is proposed. Such setup adds flow measurement capability to standard visual inspection of the fundus. The proposed instrument may provide important clinical information such as the detection of vessel occlusion provided by surgical treatments (i.e. photocoagulation). The measuring system is based on a self-mixing laser diode Doppler flowmeter (SM-DF). Reduced costs, easy implementation and small size represent the main features of SM-DF. Moreover, this technique offers the advantage to have the excitation and measurement beams spatially overlapped, thus both overcoming the alignment difficulty of traditional laser Doppler flowmeter and, well fitting with to limited optical aperture of the pupil. Thanks to an on-board DSP-microcontroller, the optoelectronic module directly estimates the blood flow; USB connection and an ad-hoc developed user-friendly software interface allow displaying the result on a personal computer. Preliminary test demonstrates the applicability of the proposed measuring system.

Citation Download Citation

Stefano Cattini and Luigi Rovati "Toward the development of a low-cost laser Doppler module for ophthalmic microscopes", Proc. SPIE 8209, Ophthalmic Technologies XXII, 82091V (9 March 2012); https://doi.org/10.1117/12.908108

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