Abstract
We investigated the relationship between physiologic statokinetic dissociation (SKD) and spatial summation in normal persons. The subjects were 13 eyes of 13 normal persons (average age : 41.9 years) with no past history of ocular disease. The kinetic program and custom program of the Humphrey Field Analyzer were followed for each subject using the targets of III 1b and III 4c to measure SKD. Spatial summation was calculated from the results of the 24 -2 program using size I, III, and V. The SKD of all normal persons for III 1b and III 4c was 18.8 +/- 3.4 and 20.1 +/- 5.4 degrees, respectively. The spatial summation for SS (III-I) and SS (V-III) was 9.8 +/- 0.7 and 4.7 +/- 0.9 (dB), respectively. Although the SKD on lower temporal meridian using the III 4c target was larger than that of the other meridian, this relation was reversed using the III 1b target. This is because the steep slope of the retina sensitivity curve in the periphery field decreases successive lateral spatial summation. Although SKD tends to be larger with the increase in age, the relationship between SKD and spatial summation was not obvious.
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