Factors associated with high postoperative myopia after penetrating keratoplasties in infants.

Sixteen penetrating keratoplasties performed in patients younger than 2 years of age were reviewed to determine which factors were associated with high postoperative refractive errors. When tissue from donors younger than 2 years was used, the mean postoperative spherical equivalent was -13.7 diopters, compared with +2.0 diopters when tissue from donors older than 2 years was used (P = 0.001). Analysis of variance suggests that the use of a 0.5-mm oversized transplant, as opposed to a 0- to 0.3-mm oversized transplant, contributed to the production of high myopia when tissue from donors younger than 2 years was used (P = 0.009). The high myopia appears to have resulted from steep transplant curvatures. Based on these results, we recommend against the combined use of corneal transplant tissue from very young donors and 0.5-mm oversized transplants for infant penetrating keratoplasties.