Noncontact Holmium: YAG Laser Thermal Keratoplasty to Correct Hyperopia: 18-Month Follow-Up
作者:
Thomas Kohnen,
Douglas D. Koch,
Peter J. McDonnell,
Richard F. Menefee,
Michael J. Berry,
期刊:
Ophthalmologica
(Karger Available online 1997)
卷期:
Volume 211,
issue 5
页码: 274-282
ISSN:0030-3755
年代: 1997
DOI:10.1159/000310808
出版商: S. Karger AG
关键词: Thermal keratoplasty;Thermokeratoplasty;Laser thermal keratoplasty;Holmium:YAG laser;Hyperopia
数据来源: Karger
摘要:
Purpose: To assess the safety and efficacy of noncontact holmium:yttrium aluminium garnet laser thermal keratoplasty (Ho: YAG LTK) for correction of low to moderate hyperopia. Methods: We performed noncontact Ho:YAG LTK on 1 eye each of 28 patients for correction of hyperopia up to +3.88 dpt. Treatments were conducted with 1 or 2 symmetrical octagonal rings of 8 spots/ring with centerline diameters of 6 mm (1 ring) or 6 and 7 mm (2 rings), 10 pulses of laser light at 5 Hz pulse repetition frequency, variable pulse energy in the range of 208-242 mJ and a nominal spot diameter between 615 and 623 µm. Results: At 18 months after surgery, 20 of 22 (91%) treated patient eyes had improved uncorrected distance visual acuity The mean change in subjective manifest refraction (spherical equivalent) was ––0.52 ± 0.35 dpt and ––1.41 ± 0.53 dpt for 1- and 2-ring treatment groups, respectively, with good stability in the refractive change after 6 months. The mean induced refractive astigmatism was small (0.30 ± 0.37 dpt/0.25 ± 0.29 dpt for 1-/2-ring treatments). None of the eyes lost 2 or more lines of spectacle-corrected distance visual acuity. There were no clinically significant changes in glare and contrast sensitivity. Conclusions: Noncontact LTK treatment of low hyperopia is safe and effective, and it is more stable and less prone to induce astigmatism than previously reported contact mode LT
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