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H Hirsbrunner
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A comparison of three methods for abbreviating G1 examinations.
The G1 glaucoma program is now widely employed in Octopus automated perimetry in order to detect early visual field damage and as an aid in regular follow up. For some patients, however, the examination duration, about 20 minutes, can be excessive. Three methods which could be used for an abbreviated initial screening phase were studied: 1) examining 30 test locations with full 2 dB minimum step size bracketing; 2) using all 59 test locations, but with 4 dB minimum step size bracketing; and 3) using 30 test locations and 4 dB minimum step size. Two indices derived from these abbreviated examination procedures were compared to those obtained from the first phase of the G1 program. The study was based on data of 1008 visual fields of both normal and pathological eyes. It was found that the 30 test location full bracketing method yielded the best agreement with the results obtained with the first phase of the G1 program. Recommendations concerning the optimal utilization of these methods in possible future versions of the G1 program are included.
Adolescent↗
A comparison of eight test location configurations for estimating G1 mean defect values.
Examinations performed with the Octopus G1 glaucoma program can last up to 20 minutes or more and this may be too long for some patients who are easily fatigued. It may also be that the examiner wishes to have a first look at examination results and then decide whether to continue examining or be satisfied with preliminary values. Eight different test location configurations consisting of 4, 8, 12, 16, 20, 24, 28 and 32 test locations for obtaining a first look at a visual field were investigated based on 764 examinations of normal and pathological visual fields. The mean errors in estimating the mean defect expected for each configuration were calculated. The results indicate that using configurations with 24 or 28 test locations for an advance estimate of the mean defect produces the least amount of error.
Adolescent↗