APPARATUS AND METHOD FOR MINIMIZING THE INFLUENCE OF CORNEAL BIREFRINGENCE ON THE ANALYSIS OF EYE FIXATION AND FOCUS USING RETINAL BIREFRINGENCE SCANNING
Kristina Irsch,David L. Guyton,Boris I. Gramatikov
申请号：
US14776763
公开号：
US20160038025A1
申请日:
2014.03.17
申请国别(地区):
US
年份:
2016
代理人:
摘要：
The present invention provides apparatus and methods for detecting fixation of an eye of a subject on a target. The methods provide for optimization of parameters of the spinning half wave plate and the fixed wave plate in the retinal birefringence scanning (RBS) design to enable uses of the “spinning artifact” frequency component. Frequency of the “spinning artifact” component is determined by half wave plate rotation speed and direction, and amplitude is determined by interaction of the spinning half wave plate with any retardance encountered in the double-pass optics such as the fixed wave plate, the corneal birefringence, and the small amount of retinal birefringence. With optimum selection of the fractional spinning frequency of the half wave plate, and the orientation/retardance of the fixed wave plate, the “spinning artifact” frequency component is essentially independent of the fixation direction and is also essentially independent of the normal range of corneal birefringence.
