One-Year Results of Microincision Toric IOLs: Prospective Japanese Multicenter Study
Narrative Responses:
Purpose
To evaluate the efficacy and safety of a new acrylic one-piece toric intraocular lens (IOL).
Methods
This prospective multicenter clinical study comprised 93 eyes of 61 patients that were implanted with a toric IOL (TC2, HOYA) at three sites from 2010 to 2012 and followed for 1 year. TC2 is a one-piece hydrophobic acrylic IOL with aspheric and yellow-tinted optics, with 3 steps of cylindrical powers (NHT15: 1.5 D, NHT23: 2.25 D, NHT30: 3.0 D). Inclusion criteria comprised the preoperative corneal astigmatisms from 0.75 to 2.99 D. Visual acuity (UDVA, CDVA), residual astigmatisms, and spectacle usage were evaluated 1 week, 1, 3, 6 and 12 months postoperatively. IOL rotation from 1 day postoperatively was also measured.
Results
At 1 year postoperatively, 75.3% of eyes achieved UDVA of 16/20 or more in total, and 83.7% with NHT15, 73.9% with NHT23, and 57.1% with NHT30, respectively. CDVA of 16/20 or more was achieved in 96.8%. While the mean preoperative corneal astigmatism was 1.46±0.55 D, the manifest astigmatism was reduced to 0.67±0.58 D (0.41±0.45 D for with-the-rule, 0.76±0.60 D for against-the-rule). 81.7% of the patients did not require distance spectacles. The mean IOL rotation was 3.15±5.32º at 1 year postoperatively.
Conclusion
The new one-piece toric IOL provided preferable clinical outcomes in the eyes with corneal astigmatisms.