Modern intraocular lenses (IOLs) are typically made of either acrylic (hydrophobic or hydrophilic) or silicone, are foldable and injectable, and have a biconvex aspheric optic with a square posterior edge.
IOL-based strategies for correcting presbyopia include pseudophakic monovision, accommodating IOLs, multifocal IOLs, and extended depth of focus IOLs. Toric platforms of presbyopic IOLs are available.
Approximately 40% of cataract surgery patients have 1.00 diopter (D) or more of preoperative keratometric astigmatism. Over 85% of adults have posterior corneal astigmatism that contributes against-the-rule corneal astigmatism.
Each degree of toric IOL rotation away from the optimal axis reduces effective astigmatic correction by 3.3%. Toric IOL misalignments greater than 30° will increase the astigmatic refractive error of the eye.
Excerpted from BCSC 2020-2021 series: Section 11 - Lens and Cataract. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.