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Toric lens an emerging treatment option for myopic astigmatism
Ophthalmology. 2010;117(12):2287-2294.
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A toric implantable Collamer lens was successful in correcting moderate to high myopic astigmatism after 1 year of follow-up, according to a study.
In the prospective, observational case series, 56 eyes of 32 consecutive patients were implanted with the Visian toric ICL (STAAR Surgical). The patients had spherical equivalent errors of –4 D to –17.25 D and cylindrical errors of –0.75 D to –4 D before surgery.
At 1-year follow-up, 91% of the eyes were within 0.5 D of the targeted correction and 100% were within 1 D; logMAR uncorrected visual acuity was –0.11 ± 0.12, and logMAR best corrected visual acuity was –0.19 ± 0.08.
In 4-mm and 6-mm pupils, the number of fourth-order aberrations did not increase significantly, according to the study. However, the area under the log contrast sensitivity function showed a significant increase from 1.41 ± 0.15 before surgery to 1.50 ± 0.13 after surgery.
Researchers observed a manifest refraction change of –0.07 ± 0.27 D from 1 week to 1 year postop. No vision-threatening complications were reported.
The authors noted the small sample size could not have detected rare complications, and a longer follow-up period and larger sample size are required to confirm these findings.