Document Detail

Spherical aberration of the reduced schematic eye with elliptical refracting surface.
MedLine Citation:
PMID:  9293524     Owner:  NLM     Status:  MEDLINE    
We extend the single-surface schematic-eye model of ocular chromatic aberration to account for spherical aberration of the eye. This extension is accomplished by allowing the model's single refracting surface to be a member of the family of ellipses with variable shape parameter (eccentricity). The resulting model, dubbed the "Indiana Eye," may have either positive or negative spherical aberration of varying degree, depending upon the numerical value of the shape parameter. Spherical aberration of the model eye is well described by third-order optical theory for shape parameters in the range 0 < or = p < or = 0.7, but requires fifth-order theory for an accurate description over the parametric range 0.7 < p < or = 1.0. An improved technique was devised for fitting the model to published measurements of ray aberrations while avoiding errors of estimation of the degree of spherical aberration present in eyes which also manifest odd-symmetric aberrations, such as coma. A shape parameter value of approximately p = 0.6 provided the best fit of the model to selected data from the literature.
L N Thibos; M Ye; X Zhang; A Bradley
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.; Review    
Journal Detail:
Title:  Optometry and vision science : official publication of the American Academy of Optometry     Volume:  74     ISSN:  1040-5488     ISO Abbreviation:  Optom Vis Sci     Publication Date:  1997 Jul 
Date Detail:
Created Date:  1997-10-21     Completed Date:  1997-10-21     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8904931     Medline TA:  Optom Vis Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  548-56     Citation Subset:  IM    
School of Optometry, Indiana University, Bloomington, USA.
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MeSH Terms
Models, Theoretical
Refraction, Ocular / physiology*
Refractive Errors / physiopathology
Vision, Ocular / physiology*
Grant Support
Comment In:
Optom Vis Sci. 1998 Apr;75(4):247-8   [PMID:  9586748 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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