Influence of stop position on spectacle magnification

Atchison, David A. & Charman, W. Neil (2014) Influence of stop position on spectacle magnification. Optometery and Vision Science, 91(1), pp. 97-102.

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Purpose To develop and use equations of spectacle magnification when the limiting stop is either the entrance pupil of the eye or an artificial pupil in front of a lens.

Methods Spectacle magnification was determined for ophthalmic lenses in air and for water environments. The reference was the retinal image for an uncorrected eye in air with a natural pupil.

Results When an artificial pupil is placed in front of lenses, spectacle magnification is hardly affected by lens power, unlike the usual situation where the natural pupil is used. The water environment provides interesting influences in which spectacle magnification is highly sensitive to the distance between the cornea and eye entrance pupil. In water, retinal images are approximately 18% bigger than in air. Wearing air-filled goggles in water increases retinal image size by about 13% compared with that when they are not worn.

Conclusions The equations extend earlier understanding of spectacle magnification and should be useful for those wishing to determine magnification of ophthalmic lens systems when artificial pupils and environments such as water are used.

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ID Code: 66341
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: aperture, entrance pupil, spectacle magnification, water
DOI: 10.1097/OPX.0000000000000124
ISSN: 1538-9235
Subjects: 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 2013 American Academy of Optometry
Copyright Statement: This is a non-final version of an article published in final form in Optometry & Vision Science: January 2014 - Volume 91 - Issue 1 - p 97-102. DOI: 10.1097/OPX.0000000000000124
Deposited On: 19 Jan 2014 23:45
Last Modified: 04 Feb 2015 05:39

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