منابع مشابه
Distensibility of the human eye.
TiE relationship between changes in pressure and changes in volume within the eye is of practical importance in the calibration of tonometers and in tonographic calculations, and the coefficient of ocular rigidity, K, proposed by Friedenwald (1937) has been employed generally for these purposes. Contrary to Friedenwald's assertion, it has been found that this coefficient is not a constant, but ...
متن کاملDistensibility of the eye.
IN clinical ophthalmology the intra-ocular pressure can rarely be determined directly, and reliance must be placed on measurements of the tension of the coats of the eye. The instruments used for the estimation of ocular tension (tonometers) measure the depth of indentation of the, globe produced by a known weight. The depth of indentation depends on several factors, the most important of which...
متن کاملStudy of Optical Models Regarding the Human Eye
Introduction: Until now, many models have been presented for optical study of the human eye. In recent years, surgery on the anterior section of the eye (such as cataract and photo-refractive surgery) has increased, so a study on the optics of the eye and evaluation of vision quality has become more important. Material and Methods: In this article, some of these models are considered. They incl...
متن کاملMonte Carlo simulation of two 106Ru eye plaques in a new mathematical human eye model
BEBIG Ruthenium-106 ophthalmic plaques have been used for treatment of uveal melanoma, retinoblastoma, melanoma of the iris and other special applications for many years. The plaques consist of a thin film of 106Ru, a beta emitter, encapsulated in pure silver. The present work proposes a new mathematical eye model for ophthalmic brachytherapy dosimetry. This new mod...
متن کاملDistensibility of the normal human lung circulation during exercise.
Increasing pulmonary arterial (Ppa) and wedge (Pw) pressures at high flow (Q) during exercise could distend the thin-walled vessels. A mechanical descriptor of vascular distension, the distensibility (alpha, fractional diameter change/mmHg pressure), has been reported to be approximately 0.02 for isolated large and small arteries, i.e., a 2% change in diameter per millimeter mercury pressure. I...
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ژورنال
عنوان ژورنال: British Journal of Ophthalmology
سال: 1959
ISSN: 0007-1161
DOI: 10.1136/bjo.43.2.97