Abstract | PURPOSE: This paper presents the results of the first human trial on the correction of hyperopia using an erodible mask excimer laser delivery system coupled to an axicon. METHODS: We treated 17 eyes of 17 patients (age range 34-62 years) for the correction of +3.21 +/- 1.04 D (range +1.00 to +4.00 D). The hyperopic correction was made using an erodible mask inserted on the laser optical pathway, to produce a circular ablation measuring 6.5 mm in diameter. An axicon was then used to create a blend transition zone from 6.5 mm up to 9.4 mm in diameter. Eyes were evaluated at one, three and six months after surgery. RESULTS: Reepithelization was always observed by the fifth postoperative day, despite the large area of deepithelization (diameter 9.5 mm). Mean refractive error one month after treatment was -2.44 +/- 1.59 D (range 0.00 to -6.50 D). Five eyes (29.4%) had a best corrected visual acuity loss more than two to three lines; all eyes showed mild annular haze not involving the central part of the cornea. Six months after treatment, mean refractive error was -0.88 +/- 0.99 D (range +0.50 to -3.00 D). Compared to preoperative status, 13 eyes (76.5%) showed an improvement in uncorrected distance visual acuity (1-8 lines), and 14 eyes (82.4%) showed an improvement in uncorrected vision at reading distance (3-7 lines). Two eyes (11.7%) showed a best corrected visual acuity loss of two of three lines. CONCLUSIONS: These preliminary results indicate this approach is effective in reducing hyperopia, while its predictability has still to be proved in a larger treatment group with longer follow-up. A cautious approach to this technique is still advisable, especially for higher hyperopic corrections, in view of the large best corrected visual acuity loss seen in two eyes at six months.
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Authors | R Brancato, F Carones, A Morico, E Venturi, L Vigo, A Spinelli, P G Gobbi |
Journal | European journal of ophthalmology
(Eur J Ophthalmol)
1997 Jul-Sep
Vol. 7
Issue 3
Pg. 203-10
ISSN: 1120-6721 [Print] United States |
PMID | 9352271
(Publication Type: Clinical Trial, Comparative Study, Journal Article)
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Topics |
- Adolescent
- Adult
- Aged
- Cornea
(physiopathology, surgery)
- Corneal Topography
- Epithelium, Corneal
(physiology, surgery)
- Female
- Follow-Up Studies
- Humans
- Hyperopia
(physiopathology, surgery)
- Lasers, Excimer
- Male
- Middle Aged
- Photorefractive Keratectomy
(instrumentation, methods)
- Postoperative Care
(methods)
- Refraction, Ocular
- Treatment Outcome
- Visual Acuity
(physiology)
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