Navatta D., Klemm M., Rumberger E., Rüther K.

University Eye Hospital Hamburg, Martinistr. 52, D - 20246 Hamburg

Introduction: Do potential differences of performance between right and left eyes depend only on the effect of training or fatigue, or are there real side-differences, which possibly correlate with age?
Probands and Methods: 48 eyes of 24 subjects (age: 25 - 55 years) are examined by perimetry with the Humphrey Field Analyzer (HFA) randomized regarding the sequence of examining right and left eyes. To exclude learning effects the subjects had to undergo a preceding training perimetry which was not evaluated. Furthermore we investigated the latencies and the amplitudes of pattern-ERG and of visual evoked potentials (VEP) (Multiliner Vision, Jaeger Toennies, Neurolab 1.6.3).
Results: The mean deviation (MD) of the first measured eyes was significantly greater (p<0.05) than that of the second measured eyes. When the right eyes were measured first, the difference of the mean deviation to the left eyes was -0.0415 +/-0.7055; when we first measured the left eyes, the difference to the right eyes was 0.09 +/-0.7674. These differences were especially pronounced in the 8 subjects older than 45 years (when right eye precedes: -0.282 +/-0.8138, left eye preceding: 0.7166 +/-0.5201). The latencies for N 35 (pattern-ERG) went up in the right eyes with increasing age (r= 0.5289; 0.005 < p < 0.01), for the left eyes there was no correlation (r= -0.2697). The latencies (N75,VEP) of the left eyes showed significant differences (p<0.05) in dependence on sequence of measurements.
Discussion: The sequence of measurements and the age of subjects seem to have an effect to the differences of performance between right and left eyes.

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