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Yasir Ahmed, Shruti Sudhakar, Ingrid U Scott, Seth Pantanelli; Influence of Corneal Asphericity on Refractive Outcome After Cataract Extraction with Aspheric Intraocular Lens Implantation. Invest. Ophthalmol. Vis. Sci. 2016;57(12):1309.
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© 2017 Association for Research in Vision and Ophthalmology.
A relationship has been identified between anterior corneal surface asphericity and refractive outcome after cataract extraction with spherical intraocular lens (IOL) implantation. The purpose of this study was to investigate whether a similar relationship exists when an aspheric IOL is implanted.
This was a retrospective study of 56 eyes undergoing cataract extraction by phacoemulsification with implantation of a 1-piece aspheric IOL (EnVista MX60, Bausch & Lomb). Biometry and corneal topography, including anterior corneal surface asphericity, were measured preoperatively using an IOLMaster 5 (Carl Zeiss) and Galilei G4 (Ziemer), respectively. Predicted refractive outcome was estimated using Holladay 1 and SRK/T formulae for the implanted IOL. Refractive outcomes were measured 1 month postoperatively and compared with the predicted refractive outcomes for each equation, which resulted in a mean numerical error (MNE) for each eye. Regression analysis was performed to investigate a relationship between corneal asphericity (Q-value) and MNE.
There was no statistically significant correlation between preoperative Q-value and MNE when the Holladay-1 (R2 = 0.012) or SRK/T (R2 = 0.0007) are used.
Anterior corneal surface asphericity influences refractive outcome after cataract extraction with spherical IOL implantation but does not correlate with refractive outcome after aspheric IOL implantation. Aspheric IOL implantation may provide improved postoperative refractive prediction since it is not affected by preoperative corneal asphericity.
This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.
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