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Measurement of Muscle Tremor Associated with Hand-Held Field Glasses

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Abstract

Muscle tremor limits the resolution of hand-held field glasses. All mechanical or optical compensations of tremor movements depends on its spectral frequency distribution.

In this paper, the spectral frequency distribution was recorded for 22 emmetropic observers between 18 and 36 years of age. Only tremor frequencies less than 20 cps are of practical importance. The frequency spectrum is a characteristic of the single observer. The position of his individual peaks remains constant for a period of more than one year. The most usual frequency maxima are in the ranges 1.3–1.7, 2.7–3.5, and 6–11 cps.

Other factors, such as weight and shape of the instrument, luminance level, and structure of the visual field, are of less significant influence.

© 1965 Optical Society of America

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