Accession Number : ADA339065

Title :   Effects of Accommodation, Vergence and Pupil Diameter on Size Estimation When Viewing Displays

Descriptive Note : Final rept.

Corporate Author : UNIVERSITY OF MANCHESTER INST OF SCIENCE AND TECHNOLOGY (UNITED KINGDOM) DEPT OF OPTOMETRY AND VISION SCIENCES

Personal Author(s) : Charman, W. N. ; Koh, L-H

PDF Url : ADA339065

Report Date : 18 JAN 1995

Pagination or Media Count : 37

Abstract : The project was designed to explore the suggestion that inappropriate judgments of the size or distance of objects might contribute to flying accidents. The hypothesis of particular interest was that such misjudgments could be caused by accommodation- dependent changes in the size of the optical image on the retina of objects having the same angular subtense but lying at different distances, allied to errors in accommodation. Thus an error in accommodation, caused perhaps by the tendency of the accommodation system to revert to its somewhat myopic tonic or resting state (Toates, 1972; Leibowitz and Owens, 1978; McBrien and Millodot, 1987), would cause the retinal image to be larger or smaller than would be the case for a correctly focused image. A larger image would be interpreted as indicating that the object was nearer than its true distance, while a smaller image would suggest that the object was further away.

Descriptors :   *OPTICAL IMAGES, *RETINA, *EYE, AVIATION ACCIDENTS, FOCUSING, VISION, RANGE(DISTANCE), OPHTHALMOLOGY, OPTOMETRY.

Subject Categories : Anatomy and Physiology
      Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE