Publication detail

Non-mydriatic video ophthalmoscope to measure fast temporal changes of the human retina

TORNOW, R. KOLÁŘ, R. ODSTRČILÍK, J.

Original Title

Non-mydriatic video ophthalmoscope to measure fast temporal changes of the human retina

Type

conference paper

Language

English

Original Abstract

The analysis of fast temporal changes of the human retina can be used to get insight to normal physiological behavior and to detect pathological deviations. This can be important for the early detection of glaucoma and other eye diseases. We developed a small, lightweight, USB powered video ophthalmoscope that allows taking video sequences of the human retina with at least 25 frames per second without dilating the pupil. Short sequences (about 10 s) of the optic nerve head (20° x 15°) are recorded from subjects and registered offline using two-stage process (phase correlation and Lucas-Kanade approach) to compensate for eye movements. From registered video sequences, different parameters can be calculated. Two applications are described here: measurement of (i) cardiac cycle induced pulsatile reflection changes and (ii) eye movements and fixation pattern. Cardiac cycle induced pulsatile reflection changes are caused by changing blood volume in the retina. Waveform and pulse parameters like amplitude and rise time can be measured in any selected areas within the retinal image. Fixation pattern ΔY(ΔX) can be assessed from eye movements during video acquisition. The eye movements ΔX[t], ΔY[t] are derived from image registration results with high temporal (40 ms) and spatial (1,86 arcmin) resolution. Parameters of pulsatile reflection changes and fixation pattern can be affected in beginning glaucoma and the method described here may support early detection of glaucoma and other eye disease.

Keywords

retinal imaging, image processing

Authors

TORNOW, R.; KOLÁŘ, R.; ODSTRČILÍK, J.

RIV year

2015

Released

17. 7. 2015

ISBN

9781628417050

Book

Proceedings of SPIE, Volume 9540

Pages from

954006

Pages to

954006-6

Pages count

6