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Keratectasia causes myopia progression after PK in keratoconus

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Increasing myopia after penetrating keratoplasty for keratoconus is associated with increasing keratometric values, according to a clinical study. Ongoing growth of the globe may also contribute to continuing myopia in some eyes, the study authors said.

C. Franz-Italon and colleagues in Vienna, Austria, examined 30 eyes of 28 patients who had undergone keratoplasty for keratoconus. The mean spherical equivalent was +2.22 D at 1 month postoperatively, drifting to –1.02 D by 2 years postoperatively. The mean keratometric levels significantly increased during the same period. No significant axial length changes were observed. Vitreous length showed a small but statistically significant change. The mean anterior chamber depth decreased significantly postoperatively, as was predicted.

The study is published in Spektrum der Augenheilkunde.