Determining the zone of reflection for posterior corneal surface comparison phakometry

Carkeet, Andrew D. (2009) Determining the zone of reflection for posterior corneal surface comparison phakometry. Ophthalmic and Physiological Optics, 29(1), pp. 99-104.

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Although comparison phakometry has been used by a number of studies to measure posterior corneal shape, these studies have not calculated the size of the posterior corneal zones of reflection they assessed. This paper develops paraxial equations for calculating posterior corneal zones of reflection, based on standard keratometry equations and equivalent mirror theory. For targets used in previous studies, posterior corneal reflection zone sizes were calculated using paraxial equations and using exact ray tracing, assuming spherical and aspheric corneal surfaces. Paraxial methods and exact ray tracing methods give similar estimates for reflection zone sizes less than 2 mm, but for larger zone sizes ray tracing methods should be used.

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ID Code: 31120
Item Type: Journal Article
Refereed: Yes
Keywords: Asphericity, Comparison Phakometry, Exact ray tracing, paraxial optics, posterior Cornea, Zone size
DOI: 10.1111/j.1475-1313.2008.00597.x
ISSN: 0275-5408
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
Deposited On: 03 Mar 2010 23:22
Last Modified: 29 Feb 2012 14:09

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