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Visual resolution as measured by dynamic and static tests

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Static visual acuity has been measured as a function of target exposure time; dynamic visual acuity as a function of target velocity. The ranges were 6–120 msec for flash exposures and 22–167°/sec for angular velocities. Frequency of seeing curves were used to determine thresholds for two groups of observers, aged 20–30 years and 40–50 years.

Visual acuity is found to deteriorate rapidly with angular velocity. The product-moment correlation and the correlation ratio were calculated in order to reveal any relation between static and dynamic visual acuity. There is no statistically significant relationship between these two types of visual discrimination abilities either in a linear or a curvilinear fashion.

Quantification of visual performance in terms of equal resolving power of the eye for a target velocity and corresponding momentary target exposure is found to be possible only up to 60°/sec.

A senile decline in acuity was observed; dioptric factors of the eye are shown to have more far reaching consequences than any age effect associated with the function of the oculomotor system.

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This work formed part of a Ph.D. thesis approved by the University of London.

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Reading, V.M. Visual resolution as measured by dynamic and static tests. Pflugers Arch. 333, 17–26 (1972).

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