vision tests probe for gaps in the neuro-retinal receptive field matrix, using bright micro dots on a dark background. Previous reports have found central-vision rarebit
tests useful for macular lesions. Their performance with lesions of the anterior visual pathways has not been explored.
Twenty-two subjects with optic nerve
lesions of light to moderate severities were examined with a novel, self-contained rarebit
test. Outcomes were contrasted with results of high-pass resolution perimetry and a threshold letter acuity test.
The results of the three tests differed significantly from those of normal control subjects. There were no meaningful inter-test correlations. Analysis of receiver-operating characteristic curves revealed closely similar powers of discrimination. Mean test time for the rarebit
test was 1:42 min, and for the other tests, it was approximately 5 min each.
test appeared highly capable of detecting optic neuropathies and chiasmal lesions. Its simplicity and short test duration indicate a useful role in screening settings.