Accession Number : AD0286487

Title :   THE TIME COURSE OF NIGHT AND SPACE MYOPIA

Corporate Author : AEROSPACE MEDICAL RESEARCH LABS WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : HEATH,GORDON G.

Report Date : AUG 1962

Pagination or Media Count : 1

Abstract : The refractive state of the human eye was measured over periods up to 4 hours in total darkness and in an empty, lighted visual field, using a subjective optometer, an infrared retinoscope, an infrared automatic recording optometer, and white light and infrared photography of the third Purkinje image. Under both viewing conditions, measurements showed a continuously varying relative myopia produced by accommodative changes, which tended to increase during the first 3-5 minutes and to vary unpredictably ther after, with continuous, irregular, rapid fluctuations of as much as 0.75 diopter (D.), occasional spontaneous changes of the predominant level by as much as 1 D., and slow drifts of as much as 1.5 D. over periods of several minutes. This highly dynamic accommodative activity in an empty visual field contrasts with previous concepts of a passive and relatively fixed ''resting state'' of accommodation under such conditions. Factors influencing this accommodative activity were also studied. (Author)

Descriptors :   *EYE, *VISION, INFRARED PHOTOGRAPHY, OPTHALMOLOGY, OPTICAL EQUIPMENT, OPTICAL IMAGES, PHOTOGRAPHY, RETINOSCOPES, SPACE PERCEPTION, TEST METHODS

Distribution Statement : APPROVED FOR PUBLIC RELEASE