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Updated: Aug 10, 2026

Rotating the Intraocular Lens to Prevent Posterior Capsular Opacification in Cataract Surgeries
Published on: July 7, 2023
Contact lens wear and IOL power calculation before cataract surgery: a cautionary tale
1Department of Ophthalmology, Musgrove Park Hospital, United Kingdom. danqbnguyen@hotmail.com
Purpose:
To present a case of erroneous corneal measurements, which led to inaccurate predicted intraocular lens (IOL) power.
Methods:
A 60-year-old woman underwent preoperative assessment for cataract surgery. The predicted IOL power was 19.5 D.
Results:
Repeated biometry led to different measurements and an 11.0-D powered IOL was inserted. The predicted IOL power was incorrect, as the patient had worn contact lenses during the preoperative assessment.
Conclusions:
This case demonstrates that errors can occur, and it is essential to fully understand the principles of biometry and the refractive issues of cataract surgery to avoid postoperative refractive errors.
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