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Editor,—Several cases of iatrogenic keratectasia have been reported after laser in situ keratomileusis (LASIK).1-4 Until now, there has been no report of keratectasia after phototherapeutic keratectomy (PTK), presumably because PTK employs less laser ablation of the corneal stroma than LASIK. Previous studies demonstrated that thickness of the residual stromal bed is critical in the development of this complication.134
We describe a case of progressive corneal ectasia following PTK for the treatment of band keratopathy. Even though the residual corneal thickness was greater than 500 μm, the patient developed steepening of the cornea, irregular astigmatism, and progressive myopia.
CASE REPORT
A 76 year old woman was referred to Miyata Eye Hospital for the treatment of bilateral band keratopathy. She had no apparent systemic or ocular disorders related to the development of …