A Comparative Analysis of Dynamic Strategy and Normal Strategy in Octopus 101 Perimeter.

Kim, Young Il; Joung, Hee Joung; Lee, Joo Hwa

Original Article

Journal of the Korean Ophthalmological Society 1999;40(4):1043-1049.
Published online April 1, 1999.

A Comparative Analysis of Dynamic Strategy and Normal Strategy in Octopus 101 Perimeter.

Young Il Kim, Hee Joung Joung, Joo Hwa Lee

Department of Ophthalmology, Inje University Pusan Paik Hospital.

Octopus 101 Perimeter에서 Dynamic Strategy와 Normal Strategy의 비교분석

김영일(Young Il Kim),정희정(Hee Joung Joung),이주화(Joo Hwa Lee)

Abstract

Dynamic strategy(DS) is a fast threshold algorithm for the Octopus 101 perimeter. To analyze the efficiency of DS, we compared the results of visual field measurements using DS and conventional normal strategy(NS). Subjects comprised 60 eyes of 30 normal individuals in the 3rd decade who has not experienced perimetry before. Program G2 was performed on all subjects at random and enough intervals between the two tests(more than 1 hour). Mean testing time was 1047.63+/-219.38 seconds in NS and 684.98+/-130.95 seconds in DS. Testing time reduction rate was 32.69+/-14.35% on average. Mean defect(MD) was 2.80+/-1.02dB, 2.15+/-0.94dB in the two strategies, respectively. Corrected loss variance(CLV) was 1.31+/-0.50dB2 and 1.03+/-0.61dB2 in each test. There was significant difference in MD and CLV statistically(P<0.01). Mean short term fluctuation(SF) was 1.38+/-0.49dB and 1.45+/-0.50 dB; mean reliability factor(RF) was 2.05+/-2.73% and 1.98+/-2.80% in the two strategies, respectively. There was no significant difference in SF and RF statistically(P>0.01). It took less time with DS than NS in Octopus 101 perimeter, but further study will be needed for clinical application of DS.

Key Words: Corrected loss variance;Dynamic strategy;Mean defect;Reliability factor;Short term fluctuation