NDLI: A new coordinate system convention in schematic eye modeling.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Simpson, Michael J.
Description	Country affiliation: United States Author Affiliation: Simpson MJ ( Alcon Laboratories Inc., Ft Worth, Texas 76134, USA. mike.simpson@alconlabs.com)
Abstract	PURPOSE: To discuss standardizing methods for presenting results from schematic eye calculations where light is entering the eye and forming an image on the retina. METHODS: Published methods, measurement equipment, and software were evaluated. RESULTS: The methods already used by ray tracing software are proposed, where everything is viewed from behind the eye and a conventional (x,y) coordinate system is used for images and plots. For meaningful evaluation in comparison to the image, any representations of the cornea, pupil, imaging wavefront, point spread function (PSF), and spot diagram are rotated by 180° about the optical axis for display to match the image orientation of a standard text chart. If a Zernike sag surface is used for a corneal surface of a schematic eye, this is also defined from the rear; however, care must be taken to ensure that the ordering of the Zernike terms is correct. CONCLUSIONS: Simulated images can be viewed from behind the eye and oriented so that text has a normal appearance. This requires a rotation of the imaging wavefront and PSF by 180° about the optical axis.
File Format	HTM / HTML
ISSN	1081597X
Issue Number	10
Journal	Journal of Refractive Surgery
Volume Number	26
e-ISSN	19382391
Language	English
Publisher	Healio
Publisher Date	2010-10-01
Publisher Place	United States
Access Restriction	Subscribed
Subject Keyword	Discipline Ophthalmology Light Models, Biological Retina Radiation Effects Vision, Ocular Physiology Humans Journal Article
Content Type	Text
Resource Type	Article
Subject	Ophthalmology Surgery

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