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Visual outcomes after toric bifocal diffractive aspheric intraocular lens (IOL) implantation
Session Title: Intraoperative Biometry and Correction of Astigmatism
Session Date/Time: Monday 07/10/2013 | 08:00-10:00
Paper Time: 09:33
Venue: Main Lecture Hall (Ground Floor)
First Author: : A.Seńaris SPAIN
Co Author(s): : B. Baamonde J. Alfonso L. Fernįndez-Vega
To evaluate the visual and refractive outcomes of the bilateral implant of a toric bifocal diffractive aspheric IOL.
Instituto Oftalmológico Fernįndez-Vega, Oviedo, Espańa
96 eyes from 48 patients who underwent lensectomy with bilateral implant of a toric bifocal diffractive aspheric IOL between January 2009 and July 2012 were studied. Mean age was 54.82±7.05 years and the lensectomy was performed due to refractive reasons, with or without cataract. Mean preoperative sphere was -0.78±7.33 between -26.00 and +9.50 and the keratometric cylinder was 3.15±1.27, between 1.5 and 7.00. IOL power was calculated using SRK-T or Holladay II formulae. Mean axial length was 24.26±2.61 mm, between 20.39 and 31.95. Phacoemulsification was performed through a temporal incision with an implant in every eye of a capsular tension ring. Residual refraction, monocular and binocular best- corrected distance visual acuity (DCVA) and best distance-corrected near visual acuity (BCNVA), binocular defocus curve and excimer laser enhancement percentage were evaluated.
At the sixth month postop, mean residual sphere was 0.17±0.51 and residual manifest cylinder -0.20±0.35. Monocular DCVA was 0.86±0.14 and binocular 0.89±0.12. Monocular BCNVA was 0.83±0.18, and binocular 0.83±0.17. Excimer enhancement percentage was 33.33% (32 eyes), mostly because of residual spheric refraction.
Implantation of a toric bifocal diffractive lens in patients with corneal astigmatism provides good far and near vision allowing the patients with a corneal astigmatism equal to or above 1.50 D. to achieve spectacle independence although a third of the cases still require a excimer enhancement.