Photorefraction ocular screening device and methods

摘要

A photorefraction ocular screening device for assessing vision and corresponding disorders associated with the human ocular system is provided. More specifically, the present invention provides for a photorefraction ocular screening device employing advanced methods of pupil detection and refractive error analysis. The photorefraction ocular screening device is comprised of an LED arrangement configured with a plurality of irradiation sources serving as visual stimuli, wherein the visual stimuli may be presented in varying illumination patterns to the pupils of an examinee for expanding the range of ocular responses that can be used to determine refractive error.

主权项

1. A computer-implemented method of acquiring pupils, said method comprising the steps of:
receiving a full frame image captured by an image capture component; decimating said full frame image to produce a decimated image; applying a pupil filter to said decimated image to identify pupil pixels; acquiring a pupil candidate from said filtered decimated image; identifying a corresponding region of interest of said pupil candidate in said full frame image; binarizing said region of interest to identify pixels representative of pupil edge; and applying a best-fit circle to said pixels representative of pupil edge.