Toric intraocular lens for correction of high corneal astigmatism in cataract patients

AIM: To evaluate the efficacy of Bi-Flex toric intraocular lens(T-IOL)(Medicontur, Medical Engineering, Ltd., Inc.)implantation to correct preexisting astigmatism in patients having cataract surgery. <p>METHODS: This retrospective consecutive study included 22 eyes of 16 patients with more than 2.50 diopters(D)of corneal preexisting astigmatism having cataract. Preoperative and postoperative uncorrected visual acuity(UCVA), best corrected visual acuity(BCVA), objective and subjective refraction and keratometric and topographic cylinder were measured. Postoperative the toric IOL axis was evaluated using vector analysis. <p>RESULTS: Postoperatively, subjective refractive cylinder was reduced significant(<i>P</i><0.05)from 4.05±1.53D to 1.35±0.86D. The component J₀ reduced in magnitude from -0.81±2.02D to -0.12±0.62D(<i>P</i><0.05). Both, UCVA and BCVA improved significantly at 1mo after surgery(<i>P</i><0.05 in both cases). After the surgery, the UCVA and BCVA were 0.24±0.19 and 0.06±0.08, respectively. The mean toric IOL axis rotation was 2.95±5.25 degree, with rotation less than 10 degrees in 86.36% of eyes. No differences in mean keratometric values obtained before and after surgery were found(<i>P</i> >0.05 for J₀and J₄₅). <p>CONCLUSION: Implantation of the Bi-Flex toric IOL is a safe and effective method to correct the preexisting regular astigmatism(greater than 2.50D)