Physiology of Crystalline Lens
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Lens-induced glaucoma in the elderly
Lens-induced glaucoma comprises a number of different glaucomatous processes occurring in the elderly that share in common the role of the crystalline lens in the mechanism of increase in intraocular pressure. We will review the anatomic predisposing factors, their physiology, signs and symptoms, and therapeutic approach. We will consider two studies and discuss the visual results and risk fact...
متن کاملSurface change of the mammalian lens during accommodation.
Classical theories suggest that the surface area of the crystalline lens changes during accommodation while the lens volume remains constant. Our recent work challenged this view by showing that the lens volume decreases as the lens flattens during unaccommodation. In this paper we investigate 1) the magnitude of changes in the surface of the in vitro isolated cow lens during simulated accommod...
متن کاملRegional distribution of the Na(+) and K(+) currents around the crystalline lens of rabbit.
Early studies described asymmetrical electrical properties across the ocular lens in the anterior-to-posterior direction. More recent results obtained with a vibrating probe indicated that currents around the lens surface are not uniform by showing an outwardly directed K(+) efflux at the lens equator and Na(+) influx at the poles. The latter studies have been used to support theoretical models...
متن کاملDiffusion of sodium in extracellular space of the crystalline lens.
PATERSON, CHRISTOPHER A., AND DAVID M. MAURICE. Di$usion of sodium in extracellular space of the crystalline lens. Am. J. Physiol. 220( 1) : 256-263. 197 1 .-The diffusion coefficients of radioactive ions were measured in bovine lens cortex, which is composed of closely packed long hexagonal cells. Diffusion could therefore be measured a) along the length of the cells, b) at right angles to the...
متن کاملThe influence of calcium-free EGTA solution upon membrane permeability in the crystalline lens of the frog
Potential difference, resistance, cation content, and 86Rb efflux were measured in frog lenses maintained in normal or calcium-free EGTA Ringer's solution. Exposure of the lens to calcium-free solution resulted in a rapid fall in potential and resistance, together with a twofold increase in 86Rb efflux rate. These rapid changes were not due to an alteration in cation distribution between the le...
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