J
John A. Parker
Researcher at University of Toronto
Publications - 12
Citations - 430
John A. Parker is an academic researcher from University of Toronto. The author has contributed to research in topics: Electroretinography & Familial adenomatous polyposis. The author has an hindex of 8, co-authored 12 publications receiving 420 citations. Previous affiliations of John A. Parker include Mount Sinai Hospital, Toronto.
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Journal ArticleDOI
Retinitis Pigmentosa: A Symposium on Terminology and Methods of Examination
Michael F. Marmor,Gustavo D. Aguirre,Geoffrey B. Arden,Eliot L. Berson,David G. Birch,Joann A. Boughman,Ronald E. Carr,Gian Emilio Chatrian,Monte A. Del Monte,John E. Dowling,Jay M. Enoch,Gerald A. Fishman,Ann B. Fulton,Charles A. Garcia,Peter Gouras,John R. Heckenlively,Dan Ning Hu,Richard A. Lewis,Günter Niemeyer,John A. Parker,Ido Perlman,Harris Ripps,Michael A. Sandberg,Irwin M. Siegel,Richard G. Weleber,Mitchell L. Wolf,Lezheng Wu,Rockefeller S.L. Young +27 more
TL;DR: This report represents a summary of opinions expressed at a meeting of specialists interested in retinitis pigmentosa (RP) and allied diseases, at which an attempt was made to define some minimum guidelines for ocular evaluation of these disorders.
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Relatively enhanced S cone function in the Goldmann-Favre syndrome.
TL;DR: Using electrophysiologic and psychophysical tests that measure rod, midspectral, and S cone function, the results suggest that the Goldmann-Favre and the enhanced S cone syndromes are linked by a common pattern of retinal dysfunction.
Journal ArticleDOI
Aspheric curvatures for the human lens
TL;DR: Spheric and aspheric conic functions were calculated for cross-sections from 60 pairs of human cadaver lenses subjected to cryofixation, finding that curvatures generally decreased with age; the aspheresis constant| a/b | remained relatively constant with age.
Journal ArticleDOI
Aspheric curvatures, refractive indices and chromatic aberration for the rat eye
TL;DR: Thicknesses and curvatures of the optic components of enucleated eyes were determined in both transverse and sagittal planes, finding that the cornea and lens surfaces are closer approximations to spheres than are the retina and choroid.
Journal ArticleDOI
Hyperornithinemia and gyrate atrophy of the choroid and retina.
TL;DR: Investigations of amino acid metabolism in vivo are consistent with the presence of a defect in ornithine keto-acid transaminase.