Influences of accommodation and myopia on the foveal Stiles-Crawford effect
Singh, Nisha, Atchison, David A., Kasthurirangan, Sanjeev, & Guo, Huanqing (2009) Influences of accommodation and myopia on the foveal Stiles-Crawford effect. Journal of Modern Optics, 56(20), pp. 2217-2230.
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
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|Item Type:||Journal Article|
|Keywords:||Aberrations, Accommodation, Defocus, Myopia, Stiles-Crawford effect|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Optometry and Ophthalmology not elsewhere classified (111399)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
|Copyright Owner:||Copyright 2009 Taylor & Francis|
|Copyright Statement:||This is an electronic version of an article published in Journal of Modern Optics, volume 56, issue 20, pages 2217 to 2230. Journal of Modern Optics is available online at informaworldTM|
|Deposited On:||11 Jan 2010 03:21|
|Last Modified:||29 Feb 2012 14:09|
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