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Comparative study of tolerance to induced astigmatism with a small aperture and trifocal IOL

Poster Details

First Author: R.Ang PHILIPPINES

Co Author(s):                        

Abstract Details


The small aperture intraocular lenses (IC-8 IOLs) can reduce astigmatic blur and bridge the gap between monofocal and toric IOLs for correcting low grade astigmatism. Tolerance to astigmatism with IC-8 IOL and Trifocal (Finevision) IOL was assessed by measuring visual acuity with various levels of astigmatic defocus induced at 90, 180 and oblique axes.


Asian Eye Institute, Makati City, Philippines


This is a prospective evaluation on 16 FineVision IOL and 20 IC-8 IOL eyes. Manifest spherocylinder refraction was performed to achieve best-corrected visual acuity in all eyes. Tolerance to induced astigmatism was studied by measuring distance visual acuity at various levels of astigmatic defocus (0.00 to 2.50 D in 0.50 D steps) at 90, 180 and oblique axes. Visual acuity was measured using a Landolt�â�€�™s C Snellen Chart and converted to logMAR at each dioptric step.


Visual acuity in the IC-8 eyes was significantly better than FineVision eyes at all dioptric steps (p < 0.05, Wilcoxon Test). Significant differences in mean acuities varied from 0.50 lines at 0.00D of defocus to 2.1 lines at 2.50D of defocus (p < 0.05, Wilcoxon Test). At 2.50D, the mean Snellen visual acuities in the IC-8 eyes and the FineVision eyes were 20/34 vs. 20/46 at 90, 20/36 vs. 20/48 at 180 and 20/38 vs. 20/60 at oblique, respectively. Overall, visual acuity of 0.1 logMAR was maintained for up to 1.5D of astigmatic defocus with the IC-8 IOL.


When compared to a trifocal IOL, the small aperture IOL is tolerant to residual postoperative astigmatism of up to 1.5D. IC-8 IOL may be very beneficial in subjects with small magnitudes of preoperative corneal astigmatism for which toric IOL are not available and in patients with postoperative refractive surprise.

Financial Disclosure:

receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented

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