Enzyme Histochemical Identification of a Subtype of Cone Photoreceptor in the Mammalian Retina

PURPOSE: To identify a subtype of cone photoreceptor in the mammalian retina using enzyme histochemical method. METHODS: In human, rabbits and cats, identification of cone photoreceptor was tried with carbonic anhydrase after retinal tissue isolation and section. RESULTS: In human, subtype of cone photoreceptor was identified. In rabbits, one type of carbonic anhydrase negative regular cell was detected and suspected as rod cells. In cats, only blue cone cell and rod cell were detected and no red-green cone cell was detected. CONCLUSIONS: In cats and rabbits, identification of red-green cone cell and blue cone cell was difficult. So, enzyme histochemical identification of cone photoreceptor using carbonic anhydrase need more research to imply in mammalian retina.

A case of Excimer Laser PRK in Schnyder's Dystrophy

PURPOSE: Schnyder's dystrophy with severe corneal opacity need lamellar or penetrating keratoplasty. But recently, excimer laser is used to decrease the corneal opacity. So we performed excimer laser PRK in myopic SCD patient. METHODS: A 34-year-old female whose chief complaint was visual hazeness had multiple needle-shape crystalline deposit and disc-shaped opacity in Bowman's membrane and superficial corneal stroma in her both eyes. We diagnosed as Schnyder's dystrophy and performed PRK on her right eye. RESULTS: After PRK, visual improvement was achieved. We report this case with literature review as we believe that our case is the first report in our country.

Two Cases of Retinal Detachment after LASIK

PURPOSE: We experienced two cases of rhegmatogenous retinal detachment after LASIK procedure. This is the first published report, so we report this with literature review. METHODS: A 40-year-old female who had undergone LASIK procedure a month before complained sudden drop in vision and on fundus examination, retinal detachment with two retinal tears was detected. And 22-year-old male who had LASIK procedure 30 months before complained sudden drop in vision and on fundus examination, retinal detachment with three retinal holes was detected. RESULTS: Retinal reattachment was achieved with vitrectomy in the first case and scleral buckling using silicone sponge in the second case and the retina remained reattached during follow-up period. CONCLUSIONS: Clinicians should be aware of retinal pathology predisposing to retinal detachment in patient undergoing LASIK.