Intraocular Pressure Changes After Experimental Retinal Photocoaglation

ABSTRACT

Retinal photocoagulation using MDS 90 Dye laser system was applied to the retina of normal pigmented rabbits(200 microgram in spot size, 0.2sec in exposure time, 200-300mW in power, 514nm in wavelength, and one spot size distance) with different number of spots and the changes of intraocular pressure(IOP) were compared with each other. The IOP was checked at pre-photocoagulation, immediately after, and 1, 2, 3, 4 hours after photocoagulation. The following results were obtained 1. The IOP immediately after photocoagulation was lower than the pre-photocoagulation IOP. 2. The IOP 1, 2 hours after photocoagulation was higher than the pre-photocoagulation IOP. 3. The IOP 2 hours after photocoagulation was the highest. 4. The IOP 1, 2 hours after photocoagulation was higher when the laser spot number was 2000 than 1000, 500, and there was no difference of IOP between 1000 and 500 laser spot numbers. 5. The IOP returned to the pre-photocoagulation level 3 or 4 hours after photocoagulation.