Abstract
Photorefraction describes a family of techniques used to measure the refractive state of the eye. The technique is commonly used for children or uncooperative subjects whose limited attention span prevents accurate measurements using the traditional techniques, such as retinoscopy. The technique can be separated into two methods, eccentric and coaxial photorefraction. All methods employ a small light source at a camera which is directed toward the eye. Some of the light reflected back from the eye enters the camera aperture. The result is a photorefracted pattern whose size is determined by the parameters of the experiment, particularly the refractive state of the eye and the pupil size. Both methods have limited working ranges and a dead zone in which changes in refractive error cannot be measured.
© 1993 Optical Society of America
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