Abstract:

Objective To evaluate the efficacy of Toric intraocular lens (IOL) for correcting low and moderate corneal regular astigmatism and its rotation stability in the bag in the cataract patients. Design Retrospective case series. Participants 59 patients (94 eyes) with age-related cataract combined with low or moderate degree of corneal regular astigmatism who visited from April to December 2017. Methods 59 cataract patients (94 eyes) were treated with phacoemulsification combined with Toric IOL (AT1BH~AT4BH) implantation. The IOL astigmatism axis marking line (the direction of minimum refractive power) coincides with the direction of maximum refractive power of the corneal astigmatism, thereby reducing residual astigmatism in the whole eye. The visual acuity, corneal astigmatism, total astigmatism, IOL axis, and complications before surgery and 3 months after the operation were observed and compared. Main Outcome Measures The visual acuity, corneal astigmatism, total astigmatism, IOL axis, and complications. Results The corneal astigmatism was (1.48 ±0.50) D pre-operation and (1.43±0.47) D at 3 months postoperatively (Z=-0.49, P=0.62). The residual astigmatism at 3 months after operation (0.38±0.29 D) was lower than the corneal astigmatism in preoperative (U=131.50, P<0.01). The visual acuity (0.83±0.13) after 3 months was higher than preoperative visual acuity (0.20±0.11) (Z=-8.69, P<0.01). At 3 months after the operation, the average deviation between the IOL axis and the predetermined axis was (2.83±2.08) degrees, 100% (94/94 eyes) of which the axial deviation was less than 8 degrees, 88.3% (83/94 eyes) was less than 5 degrees, and 68.1% (64/94 eyes) was less than 3 degrees. No complications occurred during the follow-up period. In group AT1BH, AT2BH, AT3BH and AT4BH, there was no significant difference in corneal astigmatism between pre-surgery and after 3 months (all P>0.05); the total residual astigmatism in 3 months after operation was lower than that of preoperative corneal astigmatism (all P<0.05); the uncorrected distance visual acuity in 3 months after operation was higher than that before operation (all P<0.05); and IOL axis of 3 months after operation was less than 8 degrees. Conclusion Toric IOL can effectively correct the low and moderate regular astigmatism of cornea, improve the uncorrected distance visual acuity, and have good rotation stability.

Key words: Toric intraocular lens, cataract, visual activity, astigmatism