Results 251 to 260 of about 893,609 (302)
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A Model for Crystalline Lens Accommodation
Comprehensive Therapy, 2003When a slight equatorial pull is applied to the crystalline lens, the center thickens, the central surfaces steepen, and the optical power increases. These findings are consistent with Schachar's theory of accommodation.
Chang-Hai M, Chien +2 more
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2014
The human crystalline lens is the second most important refracting element of the eye. The lens functions primarily in accommodative vision. The lens doubles in volume between birth and age 70. Approximately at age 40, the lens loses its ability to accommodate because of loss of pliability, and at age 70 the transparency of the lens is reduced ...
J. Douglas Cameron, Dejan M. Rašić
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The human crystalline lens is the second most important refracting element of the eye. The lens functions primarily in accommodative vision. The lens doubles in volume between birth and age 70. Approximately at age 40, the lens loses its ability to accommodate because of loss of pliability, and at age 70 the transparency of the lens is reduced ...
J. Douglas Cameron, Dejan M. Rašić
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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.
L T, Chylack, H M, Cheng
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Autofluorescence of the Crystalline Lens in Diabetes
Archives of Ophthalmology, 1986Lenticular autofluorescence in a diabetic population was quantitated by scanning ocular fluorophotometry. Measurements were made through the lens along the optical axis. The profile of the scan from front to rear was characterized by anterior and posterior juxtacortical peaks and a central plateau.
M A, Mosier +2 more
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Ophthalmic and Visual Optics, 1991
Visual performance is influenced in many ways by the crystalline lens, too many to do justice to here. This paper will be restricted to a discussion of how the crystalline lens influences the optical quality of the image on the retina.
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Visual performance is influenced in many ways by the crystalline lens, too many to do justice to here. This paper will be restricted to a discussion of how the crystalline lens influences the optical quality of the image on the retina.
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Hydration properties of lens crystallins
Experimental Eye Research, 1990The water binding properties of bovine lens crystallins, alpha, beta H, beta L and low molecular weight (LMW), were investigated with different techniques. The water sorptive capacity was obtained in high vacuum sorption experiments volumetrically, and also gravimetrically in controlled atmosphere experiments.
F A, Bettelheim, N, Popdimitrova
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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.
J N, Liang, X Y, Li
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Crystalline Lens Power in Myopia
Optometry and Vision Science, 1992ABSTRACT Growth of the eye shows a coordinated pattern whereby the reduction in refractive power of the cornea and crystalline lens tends to reduce the myopia that would otherwise result from the normal increase in axial length. There is some controversy as to whether the reduction in crystalline lens power is influenced by the ...
L F, Garner, M, Yap, R, Scott
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Optical Density of the Crystalline Lens
Optometry and Vision Science, 1982Abstract The 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/λ 2 , represents all light‐scattering processes in the lens.
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Analysis of crystalline lens position
Journal of Cataract and Refractive Surgery, 2006To study normal crystalline lens position to provide a comparative baseline for future studies of crystalline lens or intraocular lens shift.Taipei Municipal Yang-Ming Hospital, Taipei, Taiwan.A Scheimpflug anterior segment analyzer (EAS-1000, Nidek) was prospectively applied to measure the cycloplegic crystalline lens position in subjects who had not ...
Chao-Yu, Hu +3 more
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