SUBJECTIVE CRITICAL FLICKER FUSION (CFF) HELPS TO SEPARATE AMBLYOPIA FROM ORGANIC-DISEASE

The examination of the critical flicker fusion (CFF) in the visual fie ld center is a helpful tool in order to differentiate amblyopia from o rganic diseases such as maculopathies and neuropathies. A newly develo ped apparatus (4F) offers a simple and fast examination: ascending as well as descending thresholds of the foveal CFF can be determined. If central fixation is maintained, the test results are well reproducible . Different conditions show different results: normal thresholds or th resholds above normal are obtained in amblyopias, whereas they are bel ow normal in maculopathies and neuropathies. In optic neuritis, CFF de pends on the stage of the disease. There is no correlation between vis ual acuity and CFF in different conditions.