| Popis: |
Purpose: To investigate whether the visual field characteristics, which are well known for Goldmann stimulus size III in the central 30°, hold true for the 30°–60° visual field for stimulus sizes III, V and VI. Methods: One eye of 60 healthy participants ages 19–78 years, mean age 49.5 ± 18.0 were tested with stimulus sizes III, V and VI on two separate visits with the Humphrey 60–4 program. Pointwise between-subject variability of the average visual field of the two visits was estimated after correcting for age effects as the standard deviation across subjects. Within-subject variability was estimated as the standard deviation of the differences between visits. Results: For the 60–4 testing, the age-corrected mean sensitivity over all test locations was smallest for size III at 22 dB. It was 7 dB greater for size V and 9 dB greater for size VI. Sensitivities decreased by about 0.38, 0.34 and 0.31 dB / degree eccentricity with sizes III, V, and VI, respectively. The differences in mean sensitivity and in eccentricity effects were statistically significant among sizes (p < 0.001). Pointwise between- and within-subject variability was greatest in the nasal and superior visual field and inversely proportional to stimulus size. Conclusions: Visual field sensitivity was lower for smaller stimulus sizes and decreased with eccentricity and age. The between- and within-subject variability decreased with increasing stimulus size. These findings provide a basis for quantitative assessment of 60-4 visual field properties in patients with ocular and neurologic disorders. Keywords: Perimetry, Visual Field, Vision Testing |
