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Subretinal fluid: isoenzymes and cytologic studies.

Samples of subretinal fluid from patients with retinal detachment of various duration were studied. Acid phosphatase and nonspecific esterase activity increased with the duration of detachment. The isoenzyme patterns of both enzymes in the subretinal fluid were quite different from those of serum or retinal cells. One acid phosphatase isoenzyme and two esterases were observed in the subretinal fluid. Lactic dehydrogenase in the subretinal fluid of eyes with recent retinal detachment was identical to serum lactic dehydrogenase. A very small amount of retinal lactic dehydrogenase was observed in subretinal fluid of eyes with retinal detachment of long duration. Cytologic examination showed at least three types of cells in the subretinal fluid: Macrophages, pigment epithelial cells filled with ellipsoidal granules, and an unidentified nongranulaied cell.