Intrastromal corneal ring segments followed by PRK for postkeratoplasty high astigmatism: prospective study.

Purpose: To evaluate refractive and topographic results of the association of intrastromal corneal ring segments (ICRS) with photorefractive keratectomy (PRK) for the correction of high (>6.0 diopters [D]) postkeratoplasty astigmatism (PKA).

Setting: University of São Paulo, São Paulo, Brazil.