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Titolo:
CORNEAL TOPOGRAPHY OF EXCIMER-LASER PHOTOREFRACTIVE KERATECTOMY USINGA 6-MM BEAM DIAMETER
Autore:
HERSH PS; SHAH SI;
Indirizzi:
UNIV MED & DENT NEW JERSEY,NEW JERSEY MED SCH,DEPT OPHTHALMOL,90 BERGEN ST,6TH FLOOR NEWARK NJ 07103 HACKENSACK UNIV,MED CTR,CORNEA & LASER INST TEANECK NJ 00000 PRINCETON UNIV,DEPT ECOL & EVOLUTIONARY BIOL PRINCETON NJ 08544
Titolo Testata:
Ophthalmology
fascicolo: 8, volume: 104, anno: 1997,
pagine: 1333 - 1342
SICI:
0161-6420(1997)104:8<1333:CTOEPK>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
REFRACTIVE SURGERY; MYOPIA; ABLATION; PHOTOGRAPHY; CURVATURE; SURFACE; SYSTEMS; ISLANDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
P.S. Hersh e S.I. Shah, "CORNEAL TOPOGRAPHY OF EXCIMER-LASER PHOTOREFRACTIVE KERATECTOMY USINGA 6-MM BEAM DIAMETER", Ophthalmology, 104(8), 1997, pp. 1333-1342

Abstract

Objective: The purpose of the study is to define qualitative patternsof corneal topography after excimer laser photorefractive keratectomy(PRK) using a 6-mm beam diameter, investigate changes in patterns over time, and identify associations of topography patterns with clinicaloutcomes. Design: Multicenter, prospective cohort study. Participants: Ninety-eight eyes of 90 patients with myopia who had undergone PRK using the Summit Technology, Inc., excimer laser with a 6-mm beam diameter.Intervention: Computer-assisted videokeratography data were analyzed for eyes having undergone PRK. Topography patterns at 3, 6, and 12 months after surgery were classified and associations with clinical outcomes assessed. Main Outcomes Measured: Topography patterns after PRKwere determined at 3, 6, and 12 months after surgery. Associations with preoperative characteristics of age and attempted correction, and postoperative outcomes of uncorrected and spectacle-corrected visual acuity, predictability, astigmatism, corneal haze, glare, halo, and patient satisfaction were analyzed. Results: At 1 year, 21.4% of corneas showed a homogeneous topography, 27.6% showed a toric-with-axis configuration, 10.2% showed a toric-against-axis configuration, 7.1% showed an irregularly irregular topography, 24.5% showed a keyhole/semicircular pattern, and 9.2% showed focal topographic variants. From 3 to 6 months, 40.1% of maps changed; from 6 to 12 months, 53.1% of maps changed, generally to optically smoother, regular patterns. Older age and higher attempted correction were associated with the development of more irregular patterns. The irregular groups showed worse predictability than did the regular groups and a tendency for slight overcorrection. The average reported glare/halo of 1.33 (scale = 0 to 5) in this study was less than in a previous study of the 4.5- to 5-mm treatment zone. However, of six patients expressing dissatisfaction with the results of surgery, three ranked their glare or halo at the maximum level. Conclusions: Topography patterns using a 6-mm beam diameter are identifiable, improve with time, and may affect clinical outcomes after photorefractive keratectomy (PRK). The keyhole/semicircular pattern is more prevalent with a 6 mm treatment zone than with smaller treatment zones. Although optical side effects of glare and halo appear to be reduced with the 6-mm treatment, a small number of patients still report substantial glare or halo after the procedure.

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Documento generato il 12/07/20 alle ore 13:11:24