There are two types of test for speed of vision: a static test and a dynamic test. In the static test the eyes fixate and accommodate for a given selected distance, and the test object is exposed at that distance for the minimum time needed for its discrimination. Such conditions test only the speed of reaction of the sensorium. They give no information as to the motor functions of the eyes and the effectiveness of their coordination for the purpose of seeing. In the dynamic test for speed of vision, on the other hand, the eyes are required to shift their regard from one object to another or to a series of objects and to discriminate them in turn during the time or times of exposure. These conditions test not only the speed of reaction of the sensorium but also the oculomotor facility and efficiency.
So far as the
FERREE CE, RAND G. AN INSTRUMENT FOR MEASURING DYNAMIC SPEED OF VISION, SPEED OF ACCOMMODATION AND OCULAR FATIGUE. Arch Ophthalmol. 1936;15(6):1072–1087. doi:10.1001/archopht.1936.00840180116010
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