2020–2021 BCSC Basic and Clinical Science Course™
11 Lens and Cataract
Chapter 9: Optimizing Refractive Outcomes of Cataract Surgery
This chapter includes a related video. Go to www.aao.org/bcscvideo_section11 or scan the QR code in the text to access this content.
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.