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Capsulorhexis: its safe limits

A Vasavada1, J Desai

  • 1Iladevi Cataract & Intraocular Lens Research Centre, Raghudeep Eye Clinic, Ahmedabad.

Indian Journal of Ophthalmology
|December 1, 1995
PubMed
Summary
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A capsulorhexis opening of at least 5.5 mm is essential for safely delivering the nucleus during extracapsular cataract extraction (ECCE). Smaller openings, especially below 5.5 mm, increase the risk of posterior capsule rupture and complications.

Area of Science:

  • Ophthalmology
  • Surgical Techniques
  • Cataract Surgery

Background:

  • Extracapsular cataract extraction (ECCE) with posterior chamber intraocular lens (PCIOL) implantation is a common procedure.
  • The size of the capsulorhexis opening is a critical factor in safe nucleus delivery.

Purpose of the Study:

  • To determine the minimum safe capsulorhexis size for nucleus expression during ECCE.
  • To evaluate the relationship between capsulorhexis diameter and the risk of intraoperative complications.

Main Methods:

  • Study involved 40 patient eyes and 30 cadaver eyes undergoing ECCE.
  • Capsulorhexis sizes ranged from 4.0 mm to 7.5 mm.
  • Nucleus delivery was assessed, noting the need for relaxing incisions and occurrence of posterior capsule rupture or intracapsular extraction.

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Main Results:

  • Nuclei of all sizes were safely delivered through capsulotomies of 5.5 mm or larger in both patient and cadaver eyes.
  • Posterior capsule rupture occurred in two patient eyes with capsulorhexis of 4.5 mm and 5.0 mm.
  • Intracapsular extraction occurred in four cadaver eyes with capsulorhexis of 5.0 mm or less.

Conclusions:

  • A capsulorhexis size less than 5.5 mm is not considered safe for nucleus delivery during ECCE.
  • Larger capsulorhexis openings (≥5.5 mm) are recommended to minimize surgical risks.