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Astigmatism correction with phakic lens: retrospective analysis

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First Author: A.Cano-Ortiz SPAIN

Co Author(s):    R. Castillo   Á. Sánchez   A. Gomera   A. Villarrubia           

Abstract Details

Purpose:

• To analyse the refractive residual error and the mean residual error in the correction of astigmatism with phakic lenses, and its influence on visual acuity. • To Perform a vector analysis of refractive correction in cases of astigmatism with high and low cylindrical power. • To analyse the safety and efficacy indexes of the correction of high and low power astigmatism with toric phakic lenses.

Setting:

Hospital La Arruzafa, Córdoba, Spain. Retrospective observational analytical study.

Methods:

The medical records of patients operated in the research centre during the period were analysed. An analysis of results was performed in high / low astigmatism groups according to the implanted toric ICL lens power, so that the low astigmatism group was formed by eyes with ICL Toric lens implant with cylinder lower than +2.00 D Preoperative refraction and residual postoperative refraction were analysed, performing a vector decomposition. Vector components of treatment performed were calculated by subtracting both vectors (pre and postopt). Visual acuity pre and postop, with and without optical correction, was compared to obtain security and efficacy indexes.

Results:

A total of 142 eyes were studied. The average preop refraction was -4.98D sphere with -2.80D cylinder. The average ICL lens power implanted was -8.31D sphere +2.77D cylinder. Refractive residual was -0.04±0.33D sphere -0.29±0.49D cylinder. The average error in the astigmatism correction 4.6º. The residual cylinder in each group was -0.13±0.30D and and -0.41±0.56D in the low astigmatism and high astigmatism group, with an UCDVA 0.97-0.90 and an CDVA of 1.03-1.00 respectively. The safety and efficacy indexes in each group were 1.08±0.17 and 1.02±0.20 and 1.11±0.18 and 0.99±0.22 for the low and high astigmatism group, respectively.

Conclusions:

• The correction of astigmatism by the implantation of toric phachic lenses of the posterior chamber is safe and effective. • Vector analysis in the correction of astigmatism with posterior phakic lens implant shows an excellent correlation between the initial refraction and the applied surgical treatment. • The refractive residual has hardly any effect on visual acuity, so it cannot be considered clinically significant.

Financial Disclosure:

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