Possibility of choriocapillary occlusion under experimental subretinal hemorrhage by photocoagulation with lasers of different wavelengths.

To clarify the possibility of occluding choroidal neovascularization in subretinal hemorrhage with various laser wavelengths, lesions of experimental subretinal hemorrhage were photocoagulated with argon, dye, and krypton lasers and were examined by light and electron microscopy. Our experimental results revealed that laser photocoagulation with wavelengths longer than 590 nm was effective in occluding the choriocapillaries under a thin subretinal hemorrhage. Complete occlusion of choriocapillaries was accomplished by red dye laser (630 nm) or krypton red laser. The choroidal lesion coagulated by 590 nm dye laser showed more extensive reaction than the other lesions at a posttreatment interval of 7 days. The red dye laser (630 nm) or krypton red laser is recommended for the treatment of neovascular maculopathy under thin subretinal hemorrhage because of less reaction and complete occlusion of the choroidal neovascularization.