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Titolo:
CORNEAL OPTICAL IRREGULARITY AFTER EXCIMER-LASER PHOTOREFRACTIVE KERATECTOMY
Autore:
HERSH PS; SHAH SI; GEIGER D; HOLLADAY JT; CAVANAUGH T; HUNKELER J; MICHELSON M; OWEN J; GORDON M; PULIAFITO C; RAIZMAN M; PEPOSE J;
Indirizzi:
UNIV MED & DENT NEW JERSEY,NEW JERSEY MED SCH,DEPT OPHTHALMOL,90 BERGEN ST,6TH FLOOR NEWARK NJ 07103
Titolo Testata:
Journal of cataract and refractive surgery
fascicolo: 2, volume: 22, anno: 1996,
pagine: 197 - 204
SICI:
0886-3350(1996)22:2<197:COIAEP>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
TOPOGRAPHY; MYOPIA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
P.S. Hersh et al., "CORNEAL OPTICAL IRREGULARITY AFTER EXCIMER-LASER PHOTOREFRACTIVE KERATECTOMY", Journal of cataract and refractive surgery, 22(2), 1996, pp. 197-204

Abstract

Purpose: To assess the influence of corneal surface microirregularities on objective and subjective visual performance after photorefractive keratectomy (PRK). Setting: Multicenter clinical trial. Methods: Thealpha version of the Potential Corneal Acuity (PCA) computer program,currently under development, was used to qualitatively and quantitatively analyze the corneal surface of 176 eyes of 176 patients 1 year after PRK. Color maps of corneal surface irregularities were reviewed and quantitative values (PCA) predicting best spectacle-corrected visualacuity (BSCVA) as limited by the cornea were evaluated for associations with qualitative topography patterns, optical zone decentration, and clinical outcomes of BSCVA, uncorrected visual acuity (UCVA), subjective patient satisfaction, and a subjective glare/halo index. Results:Qualitatively, corneas after PRK were generally characterized by a ring of optical irregularity at the juncture of the ablation zone and untreated cornea, Standard corneal topography maps graded as irregular after PRK had a significantly higher PCA value than those graded as regular. There was a trend toward higher PCA values with greater optical zone decentration that was not statistically significant. Actual BSCVAwas identical to that which the PCA value predicted in 32% of patients and was within one Snellen line in 71%, within two lines in 89%, andwithin three lines in 94%. The correlation between the PCA and the glare/halo index and with subjective patient satisfaction was statistically significant. The relationship between PCA and UCVA was not significant. Conclusions: A ring of optical microirregularity of the corneal surface can appear at the juncture of the treated and untreated corneaafter PRK, indicating that the optical zone edge might affect objective and subjective postoperative visual outcomes. Further understandingof corneal surface topography and refinement of the PCA program should help explain visual outcome after PRK.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 06:15:53