Document Detail

Optics of the harbor porpoise eye in water.
MedLine Citation:
PMID:  8350146     Owner:  NLM     Status:  MEDLINE    
A two-dimensional ray-tracing model for the harbor porpoise eye is constructed from new measurements, mainly on two enucleated eyes, and from data found in the literature. Model calculations show that the crystalline lens has too much refractive power to focus light on the retina. The cornea has a high refractive index and acts as a diverging lens of considerable refractive power. The cornea corrects the eye to near emmetropia for axial and temporal (caudal) directions of view. The eye is approximately 5-D myopic for nasal (frontal) directions of view. The iris serves a dual role as a stop: the iris determines the shapes of bundles of light that enter the lens and the iris blocks light that leaves the lens anterior to its equator.
R H Kröger; K Kirschfeld
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of the Optical Society of America. A, Optics and image science     Volume:  10     ISSN:  0740-3232     ISO Abbreviation:  J Opt Soc Am A     Publication Date:  1993 Jul 
Date Detail:
Created Date:  1993-09-13     Completed Date:  1993-09-13     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8402086     Medline TA:  J Opt Soc Am A     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1481-9     Citation Subset:  IM    
Max-Planck-Institut für biologische Kybernetik, Tübingen, Germany.
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MeSH Terms
Cornea / physiology
Dolphins / physiology*
Eye / anatomy & histology
Lens, Crystalline / physiology
Ocular Physiological Phenomena*
Pupil / physiology
Refraction, Ocular
Retina / physiology
Vision, Ocular / physiology
Reg. No./Substance:

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