We read with interest the paper by Ang et al about the problem of bullous keratopathy following laser iridotomy in a Japanese hospital.1 Corneal decompensation is a serious complication causing visual morbidity, and there is cause for significant concern if the incidence after laser iridotomy is indeed truly as high as suggested in this study. We have some concerns about the presentation and interpretation of the data in this report, and ultimately the conclusions that were drawn from it.

The authors present the number and proportion of all penetrating keratoplasties performed for bullous keratopathy following laser iridotomy in Kyoto, Singapore and Nottingham (UK). Ang reported that these accounted for 20% of all …