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March 1959

The Effect of Extraocular Muscle Contraction on the Elasticity of the Eye

Author Affiliations

Bethesda, Md.
From the Ophthalmology Branch, National Institute of Neurological Diseases and Blindness, National Institutes of Health, U. S. Public Health Service, Department of Health, Education, and Welfare.

AMA Arch Ophthalmol. 1959;61(3):424-430. doi:10.1001/archopht.1959.00940090426012

In previously reported work, an expression of the elastic properties of the adult human eye by means of the equation, E (coefficient of stretch) =

P=pressure change, ΔV=volume change),1 was proposed. When pressure change is determined per unit of time, the value of E for the mean of the pressure during this period can be obtained from prepared tables. With two of the variables known, i. e., E and ΔP in the equation E=

the volume change (ΔV) can be readily calculated. The applicability of this procedure for outflow measurements in the living eye awaits confirmation of the values of E.

It was felt that a study of the influence of some extraocular factors might promote a better understanding of the problem. The experiments of the present work deal with the effect of external pressure on the elastic properties of the cat eye.

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