Results 251 to 260 of about 1,205,276 (280)
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Spherical aberration of the crystalline lens
Vision Research, 1983Split beams of varying separations from a helium-neon laser were directed through the crystalline lenses of a number of vertebrates. Photographs of the focal effects indicate the extent to which the refractive index variation of the lens and lens shape control spherical aberration.
Jacob G. Sivak, R.O. Kreuzer
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Management of the Subluxed Crystalline Lens
Ophthalmology, 1992There has been a traditional reluctance to remove a subluxed (ectopic) lens because of the high surgical risk. The use of closed intraocular microsurgical techniques, however, now allows greater intraoperative control with few complications. The authors present the results of subluxed lens extraction, by limbal or pars plana lensectomy, in 44 eyes of ...
R J Cooling +4 more
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In Vivo Photomicrography of the Crystalline Lens
Archives of Ophthalmology, 1981We describe a technique and apparatus for observing and photographing the crystalline lens in vivo and in the enucleated eye. Magnifications of x25 to x100 are easily obtainable on the film plane. The method is suitable for diagnostic observation and clinical research on cataract formation and prevention in humans, as well as for animal experimentation
Ronald A. Laing, Sven-Erik Bursell
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Interaction and aggregation of lens crystallins
Experimental Eye Research, 1991Crystallins of the normal eye lens have a specific structure that maintains lens transparency. This structure reportedly arises from a short-range order. The age-related post-translational changes and high molecular weight (HMW) aggregation disrupt the normal structure and decrease lens transparency.
Jack N. Liang, Xiao-Yan Li
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DISCISSION OF CRYSTALLINE LENS
Journal of the American Medical Association, 1916The accounts of this operation found in the larger textbooks of ophthalmology are generally unsatisfactory, that of Fuchs being least so. Better descriptions, both as to indications for the operation and technic, are found in special works dealing with ophthalmic operations, especially in Beard's "Ophthalmic Surgery"; and the best description is given ...
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Studies on the Crystalline Lens
American Journal of Ophthalmology, 1934Young dogs kept on a special bread-sour-milk-liver diet for a month after weaning were thyroparathyroidectomized. Tetany was not seen to occur in any of the young dogs so treated. Examination of the lenses of these animals indicated that there was a characteristic change in the lenses of the young, parathyroidectomized dog, very similar to that ...
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Sugar metabolism in the crystalline lens
Survey of Ophthalmology, 1978Research on the sugar metabolism of the crystalline lens, past and preent, is reviewed. The chief energy source in the lens is the Embden-Meyerhof pathway; respiration and oxidative phosphorylation become more important as the lens ages. The function of the alpha-glycerophosphate cycle is not fully understood.
Hong-Ming Cheng +3 more
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Ontogeny of human lens crystallins
Experimental Eye Research, 1985The soluble proteins from prenatal and neonatal human lenses were fractionated by gel filtration into four distinct size classes viz. high molecular weight alpha-crystallin (HM-alpha), alpha-crystallin, intermediate molecular weight (IMW) proteins and low molecular weight (LMW) proteins.
Robert C. Augusteyn, John A. Thomson
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JAMA: The Journal of the American Medical Association, 1928
AN APPEAL TO THE GENERAL PROFESSION FOR CLOSER COOPERATION IN THE WORK OF THE OPHTHALMOLOGIST For many years I have been impressed with the conviction that ophthalmology was too remotely separated from the activities of the general profession, and that there is a need to stimulate, even though in a slight degree, a spirit of mutual interest and ...
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AN APPEAL TO THE GENERAL PROFESSION FOR CLOSER COOPERATION IN THE WORK OF THE OPHTHALMOLOGIST For many years I have been impressed with the conviction that ophthalmology was too remotely separated from the activities of the general profession, and that there is a need to stimulate, even though in a slight degree, a spirit of mutual interest and ...
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Optical Density of the Crystalline Lens
Optometry and Vision Science, 1982The optical density for the noncataractous crystalline lens is written as a sum of two terms, each with a specific dependence on wavelength. The first term, proportional to 1/lambda 2, represents all light-scattering processes in the lens. The second term, assumed significant only for lambda less than or equal to 500 nm, accounts for absorption by lens
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