Efficacy Comparison Between Toric Posterior Chamber Phakic Intraocular Lens And Posterior Chamber Phakic Intraocular Lens Plus Modified Steep-Meridian Corneal Relaxing Incision For Moderate- To High-Astigmatism Corrections

To compare posterior chamber phakic intraocular lens (ICL) plus modified steep-meridian corneal relaxing incision (MS-CRI) to toric posterior chamber phakic intraocular lens (TICL) for the correction of moderate- to high-astigmatism.

Eye and ENT Hospital, Fudan University.

Myopia patients with moderate- to high-astigmatism (200 eyes) were enrolled and divided into TICL (n=100) and MS-CRI groups (n=100). All subjects underwent examinations for uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), and subjective refraction before surgery and at the 1-month and 6-month follow-ups. Vector astigmatism analysis was evaluated using the Alpins method.

During the 6-month follow-up, the MS-CRI group showed a slight regression tendency (P < 0.001) and the TICL group was stable for the astigmatism correction (P =0.510). At 6 months postoperatively, the mean magnitudes of the SIA was 1.46±0.53 D and 1.10±0.48 D (P <0.001). The correction index of the TICL group was closer to 1 compared to that of the MS-CRI group (0.95 vs. 0.76). Approximately 99% of eyes in the TICL group had angle of error within ±15°, whereas 89% eyes in the MS-CRI group were within that range. A significant relationship between the magnitudes of TIA and CI was noted in the MS-CRI group (P < 0.001), but not in the TICL group (P =0.592).

TICL could achieved better visual outcomes for correcting moderate- to high astigmatism, compared to ICL plus MS-CRI.