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Refractive and topographic outcome after intracorneal ring segment for the management of keratoconus
Author(s) -
GAVRILOV JC,
GAUJOUX T,
TOUZEAU O,
LAROCHE L,
BORDERIE VM
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.1755-3768.2010.343.x
Subject(s) - keratometer , keratoconus , dioptre , medicine , ophthalmology , visual acuity , refractive error , corneal topography , cornea , optometry
Purpose To assess the refractive and topographic outcome after Intracorneal ring segment (ICRS) implantation in the management of keratoconus. Methods Prospective case series of 10 keratoconic eyes (10 patients) with ICRS implantation (KERARING Mediphacos Inc., Belo Horizonte, Brazil). All patients were contact‐lens intolerant. The main outcome measure were uncorrected visual acuity (UCVA), best spectacle‐corrected visual acuity (BSCVA), refraction, keratometry, SAI and SRI. Patients were examined before ICRS implantation and 3 months afterward. Results Mean preoperative keratometry was 50.94 ± 5.56 Diopters (D) (range 45.81 – 59.32). KERARING implantation decreased the spherical equivalent by 1.60 ± 3.31 D and the average keratometric values by 2.05 ± 1.49 D. UCVA significantly increased from 0.16 ± 0.16 to 0.26 ± 0.25 (P< 0.05). UCVA improved in 6 eyes (5 eyes experienced 2‐ to 4‐line gain, 1 eye experienced 1‐line gain), was unchanged in 2 eyes and worsened in 2 eyes (1 eye lost 5 lines, and 1 eye lost 1 line). BSCVA increased from 0.30 ± 0.21 to 0.39 ± 0.15 (P< 0.05), BSCVA improved in 5 eyes (5 eyes experienced 3‐ to 7‐line gain), was unchanged in 1 eye and worsened in 4 eyes (3 eyes lost 1 line and 1 eye lost 2 lines). Slight correlation was found between gain in UCVA and preoperative average keratometric values (R² = 0,61) (i.e, lower was preoperative keratometric value, higher was the improvement of UCVA). SAI decreased from 3.19 ± 0.83 to 2.94 ± 0.95 (P>0.05) and SRI increased from 1.30 ± 0.38 to 1.56 ±0.52 (P>0.05). Conclusion ICRS implantation improved UCVA and BCVA in the majority of the keratoconus patients. The treatment was more efficient for patient with low preoperative keratometry values.