The electro-oculographic responses to alcohol and light in a series of patients with retinitis pigmentosa

PURPOSE. Alcohol produces changes in the electro-oculogram (EOG) similar to those caused by light, but indirect evidence indicates that alcohol direct ly affects the retinal pigment epithelium (RPE). An investigation of the al cohol-induced increase (termed the alcohol rise in this study) in patients with disease of the photoreceptors was therefore of interest. METHODS. Standard EOGs were recorded after oral administration of alcohol i n a group of patients with retinitis pigmentosa (RP). RESULTS. The average response of 17 patients to alcohol was a slow decrease of potential, which contrasts with the normal alcohol rise. In patients wi th considerable residual peripheral field, alcohol produced a small increas e of voltage, followed by a prolonged decrease. The slower decrease in the EOG voltage was evident in patients with small fields and could be seen eve n in those who had lost all visual function. Light caused small increments of EOG voltage (termed light rises), again related to the field size. CONCLUSIONS. It is probable that the intracellular signaling system that ca uses the alcohol and light rises is lost in RP.