[Histopathology of retinochoroidal adhesions of diode laser endophotocoagulation lesions in monkey eyes].
Retinochoroidal coagulation effect of 810 nm diode laser was studied using monkey eyes to determine the energy necessary to produce retinochoroidal adhesion safely. Power settings were at 100, 200 and 300 mW. The lesions produced with a power of 100 mW were faint grayish spots. One month after photocoagulation, there was degeneration from the outer granular layer to the superficial choroidal layer. However, chorioretinal adhesion was not obtained due to external limiting membrane formation. The lesions produced with a power of 200 mW were characterized by small whitish spots surrounded by grayish rings and retinochoroidal adhesions were produced by proliferated cells. However choroid were intensely coagulated, and there was a rupture of Bruch's membrane in one lesion. The lesions produced with a power of 300 mW were intense white spots surrounded by grayish rings. Histologically, severe cell loss of the retina was seen and three was no retinochoroidal adhesion. It can be said that it is difficult for 810 nm diode laser to obtain adequate retinochoroidal adhesion safely.
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Department of Ophthalmology, Nihon University School of Medicine, Chiyoda-ku, Japan.
D000818:Animals; D002829:Choroid / Q000473:pathology*; D007834:Lasers; D008028:Light Coagulation; D008251:Macaca; D012160:Retina / Q000473:pathology*