Servo-Controlled Infrared Optometer
JOSA, Vol. 60, Issue 4, pp. 548-554 (1970)
http://dx.doi.org/10.1364/JOSA.60.000548
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Abstract
A device is described that provides an electrical signal proportional to the instantaneous refractive power of the human eye. Infrared light illuminates a target whose optical distance from the subject’s eye can be changed rapidly. The position of this target is servo controlled in such a way that it remains conjugate with the retina regardless of changes of the subject’s state of accommodation. The position of the target provides a direct measure of refractive power. The device may be used on an undrugged eye and does not interfere with normal visual tasks.
Citation
TOM N. CORNSWEET and HEWITT D. CRANE, "Servo-Controlled Infrared Optometer," J. Opt. Soc. Am. 60, 548-554 (1970)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-60-4-548
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