Premium
Ablation rate of PMMA and human cornea with a frequency‐quintupled Nd:YAG laser (213 nm)
Author(s) -
Shen Jin H.,
Joos Karen M.,
Manns Fabrice,
Ren Qiushi,
Fankhauser Franz,
Denham David,
Sôderberg Per G.,
Parel JeanMarie
Publication year - 1997
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/(sici)1096-9101(1997)21:2<179::aid-lsm9>3.0.co;2-n
Subject(s) - ablation , cornea , materials science , excimer , excimer laser , laser , photoablation , optics , photorefractive keratectomy , dioptre , ablation zone , laser surgery , laser ablation , biomedical engineering , medicine , physics , visual acuity
Background and Objective As an alternative to the standard excimer laser used for PRK, we investigated the ablation rate at 213 nm of PMMA, and human corneas under controlled hydration. Study Design/Materials and Methods The output of a frequency‐quintupled Nd:YAG laser (213 nm) was transformed into a quasi‐Gaussian beam. PMMA and corneal lenticules maintained under controlled hydration were ablated until perforation was detected. Results The ablation rate of PMMA and cornea at 213 nm were similar to that at 193 nm when radiant exposure was below 200 mJ/cm 2 and increased gradually between one and two times faster than that at 193 nm when radiant exposure was > 200 mJ/cm 2 . Conclusions PMMA and cornea ablation at 213 nm are similar to that at 193 nm and are different from that at 248 nm. The difference between PMMA and cornea ablation rates should be considered when using PMMA to test ablated diopter and smoothness for photorefractive surgery. Lasers Surg. Med. 21:179–185, 1997. © 1997 Wiley‐Liss, Inc.