Corneal iron ring after hyperopic photorefractive keratectomy

Abstract

The ring-shaped iron deposition after PRK for hyperopia must be differentiated from the Fleischer ring. Our results suggest that the slitlamp findings of peripheral corneal iron deposition in hyperopic PRK patients correlate with achieved correction.

Corneal Iron Line Following LASIK With Epithelial Ingrowth

“…The lines appeared in 5 of 10 patients 9 months after implantation and ran concentric to the ring implants. Following hyperopic PRK, 15% of patients in another recent study were noted to have ring-shaped corneal iron deposits, 11 where the iron ring was located in the peripheral flat ablation zone adjacent to the steepened central cornea. Similarly, a ''pseudo-Fleischer ring'' was reported in 1 case following hyperopic LASIK, 17 so named because of its resemblance to the line found in association with keratoconus.…”

“…7,8 More recently, epithelial iron lines have been reported after a number of refractive corneal procedures, with both uncomplicated and complicated postoperative courses. These include radial keratotomy, 9 intrastromal corneal ring implantation, 10 photorefractive keratectomy (PRK), 11 and laser in situ keratomileusis (LASIK). 12 In one case reported by Ozdamar et al, 13 an iron line was noted at the base of iatrogenic keratectasia following myopic LASIK, mimicking Fleischer ring.…”

Central Corneal Iron Deposition After Myopic Laser-Assisted In Situ Keratomileusis

“…1 Different shapes of iron deposition may also be evident after refractory corneal procedures such as penetrating keratoplasty (annular line), 2 lamellar keratorefractive surgery (paracentral ring), 3 radial keratotomy (central satellite line), 4 intrastromal corneal ring (mid-peripheral arcuate line), 5 hyperopic photorefractive keratectomy (PRK) (peripheral ring), 6 myopic PRK (central spot), 7 hyperopic laser-assisted in situ keratomeliusis (LASIK) (paracentral ring), 8 myopic LASIK (ring or patch near the margin of the ablated zone), 9 and orthokeratology (ring coinciding with fitting curve). 10 Moreover, such deposits have been reported to be related to the steep central island after myopic PRK 11 and to iatrogenic keratectasia after myopic LASIK.…”