[Under cover penetrating keratoplasty: a safer technique, especially for children]

Penetrating keratoplasty is usually performed when the cornea has lost all transparency Irrespective of the instruments used, the most awkward step occurs when the cornea is removed. In aphakic and infant eyes there is a high risk of lens expulsion, vitreous loss, or choroidal effusion. Under-cover penetrating keratoplasty never leaves the anterior segment exposed, and is therefore safer for infant and aphakic eyes and when large-diameter trepanation is necessary.