Corneal refractive changes after acrysof lens versus PMMA lens implantation.

Abstract

PURPOSE:

Do foldable acrylic lenses yield not only reduced posterior capsular opacification but also significant refractive advantages?

PATIENTS AND METHODS:

147 cataract patients including 47 with spherical corneas and 100 with preoperative astigmatism of 0.8 +/- 0. 7 dpt were treated in one of two ways: 70 patients received 5.5-mm Acrysof lens implants through 3.2-mm outer and 4-mm inner temporal clear corneal openings (stretch incision); 77 patients received 5-mm PMMA lenses through temporal clear corneal incisions of 4.1-mm outer and 6.5-mm inner diameter incisions. Corneal topography was examined in all patients before the operations as well as 3 days and 6 months after the operations.

RESULTS:

6 months after the operations, we observed a surgically induced astigmatism of 0.4 +/- 0.2 dpt for the 3.2-mm incisions compared to 0.8 +/- 0.7 dpt for the 4.1-mm incisions; evaluation according to Holladay of the preoperative spherical corneas yielded a with-the-wound change of 0.0 +/- 0.3 dpt after 3.2-mm incisions versus 0.6 +/- 0.7 dpt after 4.1-mm incisions. The difference in astigmatism for the two types of incisions was statistically significant (p = 0.001).

CONCLUSION:

Acrysof lens implantation is especially useful for patients with spherical corneas because of avoidance of postoperative astigmatism. The 4. 1-mm corneal incision using PMMA lens implants can be used on the steep meridian to reduce preoperative astigmatism.

• Authors: K Müller-Jensen, B Barlinn
• Journal: Ophthalmologica. Journal international d'ophtalmologie. International journal of ophthalmology. Zeitschrift fur Augenheilkunde (Ophthalmologica) 2000 Sep-Oct Vol. 214 Issue 5 Pg. 320-3 ISSN: 0030-3755 [Print] Switzerland
• PMID: 10965244 (Publication Type: Clinical Trial, Comparative Study, Journal Article, Randomized Controlled Trial)
• Copyright: Copyright 2000 S. Karger AG, Basel

Chemical References

• Biocompatible Materials
• Polymethyl Methacrylate

Topics

• Astigmatism (etiology, physiopathology, prevention & control)
• Biocompatible Materials
• Cataract Extraction
• Cornea (physiopathology, surgery)
• Corneal Topography
• Humans
• Lens Implantation, Intraocular
• Lenses, Intraocular
• Polymethyl Methacrylate
• Postoperative Complications (physiopathology, prevention & control)
• Prospective Studies
• Prosthesis Design
• Refraction, Ocular