Astigmatism correction with toric intraocular lens during cataract surgery

Abstract

Currently toric intraocular lens (TIOL) implantation is the most reliable method to correct pre-existing corneal astigmatism of 1D or more at the time of cataract surgery. A good surgical outcome depends on proper patient selection, accurate preoperative measurements, precise intraocular lens (IOL) power calculation and execution of proper surgical plan. Accurate keratometry measurement on a pristine cornea is crucial in TIOL power calculation. The recognition of the importance of posterior corneal astigmatism and its inclusion into various formulas and recent methods to measure it directly have resulted in better postoperative refractive outcomes. Fine-tuning of surgery with digital guidance in TIOL alignment and new lens designs with better rotational stabilities have helped achieve more predictable outcomes. Postoperative IOL rotation is the major cause of patient dissatisfaction after TIOL surgery. However, various correction algorithms and formulas are available which can help optimal corrective re rotation to address this problem satisfactorily.

Keywords

• astigmatism
• cataract surgery
• toric intraocular lenses