Outcome of Therapeutic Penetrating Keratoplasty Using Glycerol-Preserved Donor Corneas in Infectious Keratitis

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To the Editor:
We commend Thanathanee et al1 for an excellent study reporting the surgical outcomes and complications of therapeutic penetrating keratoplasty using glycerol-preserved corneas in infectious keratitis. However, a few untouched and warranted issues need further discussion. First, the storage times of donor corneas varied between 2 days and 62 months.1 Why were the 2-day old corneas preserved in glycerol? Was it due to nonavailability of Optisol? Second, the exclusion criteria were infectious keratitis cases with a history of therapeutic penetrating keratoplasty using Optisol-preserved corneas; whereas in the text it is mentioned that 2 patients (numbers 19 and 22) underwent transplant with Optisol-preserved corneas. Third, in this study, topical steroids were used in some cases. In which cases of infectious keratitis were steroids used? Fourth, there is some discrepancy in the authors' statement that “donor cornea sizes ranged from 7.5 to 9.5 mm” and “the trephination sizes of recipients ranged from 6.5 to 9.5 mm” with “the donor corneal buttons being oversized by 0.50 mm.
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