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Shape of the retinal surface in emmetropia and myopia

Atchison, David A., Pritchard, Nicola, Schmid, Katrina L., Scott, Dion H., Jones, Catherine E., & Pope, James M. (2005) Shape of the retinal surface in emmetropia and myopia. Investigative Ophthalmology and Visual Science, 46(8), pp. 2698-2707.

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Abstract

PURPOSE: To determine and compare the shapes of the retinas of emmetropic and myopic eyes. METHODS: Nonrotationally symmetrical ellipsoids were mathematically fitted to the retinal surfaces of 21 emmetropic and 66 myopic eyes (up to -12 D) of participants aged 18 to 36 years (mean, 25.5) using transverse axial and sagittal images derived from magnetic resonance imaging. RESULTS: The shapes of the ellipsoids varied considerably between subjects with similar refractive errors. The shapes were oblate (steepening toward the equator) in most of the emmetropic eyes (i.e., the axial dimensions of the ellipsoids were smaller than both the vertical and horizontal dimensions). As myopia increased, all ellipsoid dimensions increased with the axial dimension increasing more than the vertical dimension, which in turn increased more than the horizontal dimension (increases in approximate ratios 3:2:1). The relative difference in the increase of these dimensions meant that as the degree of myopia increased the retinal shape decreased in oblateness. However, few myopic eyes were prolate (flattening toward the equator). Independent of myopia, the ellipsoids were tilted about the vertical axis by 11 degrees +/- 13 degrees , and ellipsoid centers were decentered horizontally by 0.5 +/- 0.4 mm nasally and 0.2 +/- 0.5 mm inferiorly, relative to the fovea. CONCLUSIONS: In general both emmetropic and myopic retinas are oblate in shape, although myopic eyes less so. This finding may be relevant to theories implicating the peripheral retina in the development of myopia.

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ID Code: 4274
Item Type: Journal Article
Additional Information: For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: d.atchison@qut.edu.au
Keywords: Myopia/, etiology, Retina/, anatomy & histology, Adolescent, Adult, Anterior Eye Segment/anatomy & histology, Body Weights and Measures, Comparative Study, Female, Humans, Magnetic Resonance Imaging, Male, Research Support, Non, U, S, Gov't, Sex Factors
DOI: 10.1167/iovs.04-1506
ISSN: 1552-5783
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2005 Association for Research in Vision and Ophthalmology
Deposited On: 14 Jun 2006
Last Modified: 29 Feb 2012 23:15

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