Influences of accommodation and myopia on the foveal Stiles–Crawford effect

Autor:	Sanjeev Kasthurirangan, David A. Atchison, Huanqing Guo, Nisha Singh
Rok vydání:	2009
Předmět:	business.industry Stiles–Crawford effect Stimulus (physiology) Luminance Atomic and Molecular Physics and Optics Pupil Aberrations of the eye Optics Foveal Optometry Accommodative lag business Accommodation Mathematics
Zdroj:	Journal of Modern Optics. 56:2217-2230
ISSN:	1362-3044 0950-0340
Popis:	We determined the foveal Stiles–Crawford effect (SCE) as a function of up to 8D accommodation stimulus in six young emmetropes and six young myopes using a psychophysical two-channel Maxwellian system in which the threshold luminance increment of a 1 mm spot entering through variable positions in the pupil was determined against a background formed by a 4 mm spot entering the pupil centrally. The SCE became steeper in both groups with increasing accommodation stimulus, but with no systematic shift of the peak. Combining the data of both groups gave significant increases in directionality of 15–20% in horizontal and vertical pupil meridians with 6D of accommodation. However, additional experiments indicated that much of this was an artefact of higher order aberrations and accommodative lag. Thus, there appears to be little changes in orientation or directionality in the SCE with accommodation stimulus levels up to 6 D, but it is possible that changes may occur at very high accommodation levels.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3354c0fce90d891bb00d582217b5d43d https://doi.org/10.1080/09500340902721915 Zobrazit plný text záznamu