One of the most common sayings here on CataractCoach.com is, “Don’t make a baby rhexis!” because a small capsulorhexis will make the rest of the surgery more difficult. So why does it look like the Cataract Coach himself has made a baby rhexis in this case? The capsulorhexis is perfect and the actual issue is that this is a very large eye!
Measuring the intended capsulorhexis size is especially important when operating on a very large eye with an enlarged anterior segment and a corneal diameter of 13.5 millimeters accompanied by a 10.5 millimeter dilation. In such eyes the anterior chamber is deeper and the crystalline lens often appears proportionally smaller, making spatial judgment more difficult. An oversized capsulorhexis risks extending to the zonules or failure to overlap the edge of the IOL optic, increasing the likelihood of postoperative lens decentration. Conversely an undersized capsulorhexis can complicate nuclear manipulation, impede cortical removal, and limit the effective lens position predictability. Precise measurement helps ensure a well centered circular opening that maintains optimal overlap of the intraocular lens optic, which is essential for long term stability and refractive accuracy. Careful planning also improves safety because the unusually large dilation can create a misleading sense of scale during surgery.
