Long-term optical quality of the photoablated cornea

Marco Lombardo, Giuseppe Lombardo, Sebastiano Serrao

Research output: Contribution to journalArticle

Abstract

High-order cereal wavefront analysis was performed in a population of 60 myopic eyes that underwent photo-refractive keratectomy. Corneal aberration data over 3, 5, and 7 mm pupils were collected for up to three years after surgery. The optical performance of the anterior cornea was characterized by estimation of the modulation transfer function (MTF) and the point-spread function. The high-order corneal wavefront aberrations were shown to stabilize one year after surgery. Over photopic pupils, after an early slight increase, corneal RMS-high-order aberrations (HOA) tended to decrease toward preoperative values. On the other hand, over mid-and large-pupil sizes, corneal HOA significantly increased compared with the preoperative state, while the optical performance of the cornea was diminished. The MTF ratio showed a distinct decline in the optical quality of postoperative corneas at low and middle spatial frequencies over larger pupils in the range between 6 and 19 c/deg, especially for deeper ablations.

Original languageEnglish
Pages (from-to)588-596
Number of pages9
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume24
Issue number3
DOIs
Publication statusPublished - 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Vision and Pattern Recognition

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