J Korean Ophthalmol Soc.  2015 Apr;56(4):477-484. 10.3341/jkos.2015.56.4.477.

Rotational Stability after Toric Implantable Collamer Lens Implantation

• Lee D
• Lee SJ
• Kyung H

• KMID: 2215696
• DOI: http://doi.org/10.3341/jkos.2015.56.4.477

Abstract

PURPOSE
To evaluate rotational stability of Toric Implantable Collamer Lens (ICL) implantation to correct myopic astigmatism.
METHODS
We estimated the degree of Toric ICL rotation together with change in visual acuity and astigmatism in 118 eyes of 66 patients who underwent Toric ICL implantation and had a long-term mean follow-up period of 37 months.
RESULTS
After Toric ICL implantation, 107 (91%) out of 118 eyes showed uncorrected visual acuity of 0.8 or better. The mean postoperative astigmatism decreased to -0.64 +/- 0.61 D from a mean preoperative astigmatism of -2.96 +/- 1.13 D. The mean axis change of Toric ICL was 2.4 +/- 3.8 degrees during follow-up period. Two (1.7%) out of 118 eyes showed the axis change of more than 10 degrees. These two eyes had a decrease in visual acuity, rotational axis change of 18 degrees and 30 degrees, respectively, and increases in astigmatism of 1.50 D and 1.00 D, respectively. The remaining 116 eyes (98.3%) showed excellent rotational stability without visual acuity decreasing Toric ICL rotation during the follow-up period.
CONCLUSIONS
Toric ICL implantation to correct high myopia with astigmatism rarely has axis rotation and maintains excellent rotational stability for long-term follow-up.

Keyword

Myopic astigmatism; Rotational stability; Toric ICL

MeSH Terms

Astigmatism
Axis, Cervical Vertebra
Follow-Up Studies
Humans
Myopia
Visual Acuity

Figure

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  Figure 1. Mean log MAR uncorrected distance visual acuity (UCVA) and log MAR best-corrected distance visual acuity before and after Toric ICL implantation. The preoperative mean log MAR UCVA of +1.71 ± 0.41 changed to -0.02 ±0.41 at last follow-up. And the preoperative mean log MAR corrected visual acuity of +0.03 ± 0.08 changed to -0.05 ±0.09 at last follow-up. ICL = implantable collamer lens; BCVA = best-corrected distance visual acuity.

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  Figure 2. Comparison between preoperative cylinder and postoperative last follow-up cylinder after Toric ICL implantation. The postoperative cylinder at last follow-up was within 0.50 D in 66 eyes (56%) and within 1.00 D in 105 eyes (89%). ICL = implantable collamer lens.

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  Figure 3. Toric ICL axis change after the surgery. The Toric ICL axis changes until the last follow-up were within 5 degrees in 107 eyes (90.7%), between more than 5 degrees and 10 degrees or less in 9 eyes (7.6%), and over 10 degrees in 2 eyes (1.7%). ICL = implantable collamer lens.

Reference

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