isual acuity and refraction of radial keratotomy in 207 eyes were consecutivly studied fortwo years. The overwhelming morjority cases showed hyperopia in early postoperative period

andonly 19、8% of eyes had normal vision in three days after surgery.By the time past

the proportionof nomal vision cases increased

while hyperopia cases drcreased. In mild and moderate myopia

theeffects of RK trented to stability 1-3 months postoperatively

and the eyes with visual acuity of 5. 0 or better accounnted for 89. 5% and 92.4% respectively at two years。 In high myopia and vety highmyopia vlsual acuity were better in early stage than that in Iater stage。 49. 3% of eyes(high my-opia)and 19. 0% of eyes(very high myopia) achieved visual acuity of 5.0 or better two years aftersurgery. daily visual fluctuation and individual differences were studied as well。