In:
Human Factors: The Journal of the Human Factors and Ergonomics Society, SAGE Publications, Vol. 34, No. 3 ( 1992-06), p. 289-301
Abstract:
The apparent size of an object is diminished when accommodation of the eye moves inward to a position closer to the observer than to a viewed object. This phenomenon is called accommodation micropsia. Using schematic eyes, we investigated change in retinal image size caused by a change in accommodation. The use of schematic eyes is also discussed and is justified. The calculated magnitude of this diminution for four schematic eyes ranged from unity at infinity to a maximum of 0.98 (- 2%) at about 12.0 diopters (D). For distances at which accommodation micropsia is typically observed (about 2.0 D), retinal minification is less than 0.997 (- 0.3%). Thus changes in the size of the retinal image attributable to accommodation are virtually negligible when compared with the observed reduction of 3% to 33%. This suggests that accommodation micropsia is mediated almost entirely by processes other than those involving the optics of the eye.
Type of Medium:
Online Resource
ISSN:
0018-7208
,
1547-8181
DOI:
10.1177/001872089203400304
Language:
English
Publisher:
SAGE Publications
Publication Date:
1992
detail.hit.zdb_id:
2066426-6
