Abstract

During infrared photoretinoscopy (see Schaeffel, Farkas and Howland, 1987, and "Topical Meeting on Noninvasive Assessment of the Visual System", Monterey, California, 1986), the refractive state is calculated from the intensity profile of the fundus reflex in the pupils of a subject (Howland, 1985). The size of the pupils can also be easily measured in the video image. And, finally, the direction of gaze can be determined from the relative position of the Purkinje reflex in the pupil. While all three of these parameters are basically accessible to direct measurement in single stored video frames, their temporal properties cannot be recorded.

© 1991 Optical Society of America