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Keratoconus in refractive surgery candidates
Author(s) -
PENA RUIZ D,
CORTES MORA N,
GALARRETA MIRA D,
MARTIN R,
CARRASCO HERRERO B,
MERAYOLLOVES J
Publication year - 2010
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2010.344.x
Subject(s) - keratoconus , ophthalmology , medicine , refractive surgery , prolate spheroid , incidence (geometry) , corneal topography , cornea , surgery , optics , mathematics , mathematical analysis , physics
Purpose To report keratoconus incidence in refractive surgery candidates and to compare their characteristics in scanning‐slit topography variables versus candidates with prolate corneas and a group with previous diagnosis of keratoconus. Methods All consecutive patients who underwent preoperative evaluation for refractive surgery in the last thirty‐six months were selected. Corneal scanning‐slit topography was performed in all the patients in the preoperative examination to detect patients affected by keratoconus and subjects with prolate corneas (K reading >47,2D). An additional group of keratoconic eyes was included. Age, gender, central corneal thickness (CCT), anterior best fit sphere (aBFS), posterior best fit sphere (pBFS), steepest simulated K (SSK), flattest simulated K (FSK), and irregularity index at 3 and 5mm (II3, II5) were studied. Results A total of 1662 patients (3324 eyes) were included . Ninety‐six patients (190 eyes) had a steepest K reading higher than 47,2D and among them, 10 patients (20 eyes) were identified as keratoconus (0,6%). Keratoconus group included 182 eyes. Patients with prolate corneas (PC) were older (42,95 y± 9,6) than keratoconic candidates (KC) (38,22 y±11,39)(p<0,01) and keratoconus group (KG) (35,47y±11,5)(p<0,03). aBFS was higher in PC (44,94±1,38D) than KC (43,89±1,61D)(p<0,001) and than KG (44,31±1,97D)(p<0,03). II3 and II5 was lower in PC (1,54±1,38 and 2,85±7,2) than KC (4,48±2,94 and 10,43±2,1)(p<0,001) and than KG (5,18±2,69 and 6,1±4,17)(p<0,001). CCT was higher in PC (556,04±45,07 microns) than in KC (476,95±65,45 microns)(p<0,02) and than in KG (441,63±65,04 microns)(p<0,001) Conclusion Keratoconus prevalence in refractive surgery candidates is high and has a similar profile to KG.