Light peak to dark trough ratio in clinical electro-oculography: influence of dark oscillations on the following light peak.

In the clinical standard EOG procedure the light rise potential is influenced by the preceding dark troughs oscillation. This is apparent in the different configuration of the light rise potential when following a dark trough instead of a steady state. Uninfluenced responses can be obtained only under steady-state conditions. Recording of the light peak potential in this manner may be used on a trial basis for clinical routine examination. Experimental and more detailed clinical studies require separate recording of light peak and dark trough potential, each preceded by a steady state. The evaluation of these responses, expressing them in percent of the steady state, should reveal more information than can be expected from the standard light peak to dark trough ratio.