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.

© 1970 Optical Society of America

High-Speed Infrared Optometer

F. W. Campbell and J. G. Robson
J. Opt. Soc. Am. 49(3) 268-272 (1959)

High-Resolution Optometer for the Continuous Measurement of Accommodation*

Jay Warshawsky
J. Opt. Soc. Am. 54(3) 375-379 (1964)

Dynamic optometer

David C. Wilson
J. Opt. Soc. Am. 64(2) 235-239 (1974)

Three-dimensional optometer

Tsunehiro Takeda, Yukio Fukui, and Takeo lida
Appl. Opt. 27(12) 2595-2602 (1988)

Binocular infrared optometer for measuring accommodation in both eyes simultaneously in natural-viewing conditions

Fumio Okuyama, Takashi Tokoro, and Masanao Fujieda
Appl. Opt. 32(22) 4147-4154 (1993)