| 摘要 |
<p>An autorefractor utilizes two light emitters (150, 160) and corresponding optics to project images onto the fundus, with the focus of these images bracketing the gross sphere of an emmetrope. A single detector (180) generates a signal corresponding to each emitter. In an alternate embodiment, a single emitter (406) and two detectors (402, 404) having foci bracketing the gross sphere of an emmetrope generate a signal corresponding to each detector. The light reflected from the fundus is detected and the differential intensities of two signals are used to determine departure in refraction from O diopter sphere. Multi-segmented or CCD detectors may be used to measure cylinder/axis, determine length and direction of gaze (in combination with a Purkinje image sensor) and to generate and analyze retinal images.</p> |
