Humphrey SITA and Octopus TOP Perimetry on Normal Korean Subjects

ABSTRACT

PURPOSE: To evaluate and compare the inter-individual variability and normal limits of Humphrey SITA and Octopus TOP which were recently developed for shortening test time and decreasing the patient's fatigue. METHODS: Humphrey SITA and Octopus TOP tests were performed on 100 normal Korean subjects and their test results were analyzed. RESULTS: The average test duration was 294.02+/-29.61 seconds in SITA and 147.93+/-9.78 seconds in TOP. There was no significant difference between the two perimetric tests in MD (mean deviation), but PSD (pattern standard deviation) of TOP program was significantly higher than that of SITA (P< 0.01). Mean sensitivity of SITA was 30.15+/-1.00 dB and that of TOP was 26.79+/-1.11 dB, so mean sensitivity of SITA was about 3 dB higher than that of TOP. In topographical map, averaged threshold sensitivity decreased with the eccentricity in both perimetries. Topographically, SITA showed the more regularly increasing standard deviation of threshold sensitivity toward periphery of visual field, but TOP showed the irregular pattern of distribution of the standard deviation. Most of the subjects (88.8%) replied that they were more comfortable with the TOP than the SITA program because of the shorter test time. CONCLUSION: Inter-individual variability in the normal Korean subjects was smaller in Humphrey SITA than Octopus TOP program, but Octopus TOP had the advantage of shorter duration of the test and lower fatigue.