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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

Purpose:

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.

Setting:

Asian Eye Institute, Makati City, Philippines

Methods:

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.

Results:

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.

Conclusions:

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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