Vector analysis of astigmatic changes after cataract surgery with toric intraocular lens implantation

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• 作者：Jorge L. Ali&#xf3 ; MD ; PhD ; ^a ; ^{jlalio@vissum.com"" rel=""nofollow} ; David P. Pi&#xf1 ; ero PhD^a ; Javier Tomá ; s MSc^a ; Alicia Ales&#xf3 ; n MSc^a [Author vitae]
• 刊名：Journal of Cataract and Refractive Surgery
• 出版年：2011
• 出版时间：June 2011
• 年：2011
• 卷：37
• 期：6
• 页码：1038-1049
• 全文大小：434 K

文摘

lass=""h4"">Purpose

To analyze the astigmatic changes after cataract surgery with toric intraocular lens (IOL) implantation and determine the relationship between these changes and the final visual outcomes.

lass=""h4"">Setting

Vissum-Instituto de Oftalmológico de Alicante, Alicante, Spain.

lass=""h4"">Design

Prospective case series.

lass=""h4"">Methods

This study comprised eyes with visually significant cataract that had surgery with Acrysof toric IOL implantation. Refractive, corneal topography, internal astigmatism, and contrast sensitivity outcomes were evaluated over 6 months. The Alpins vectorial method was used to analyze the target (TIA) and surgically (SIA) induced astigmatism, difference vector, magnitude of error, flattening effect, and torque.

lass=""h4"">Results

The study enrolled 27 eyes (21 patients). Postoperatively, there was a significant reduction in refractive cylinder (P<.01) with an associated visual improvement (P<.01). The magnitude of the SIA vector was significantly lower than the TIA 1 month and 6 months after surgery (P<.01). The mean magnitude of the difference vector was 0.91 diopter (D) ± 0.45 (SD) at 6 months, with no significant differences between postoperative visits (p>0.19). The mean magnitude of torque vector was 0.59 ± 0.42 D at 6 months. There was a significant negative correlation between refractive cylinder and the magnitude of torque (r ≤−0.54, P<.01) and the difference vector (r = −0.98, P<.01).

lass=""h4"">Conclusion

The toric IOL restored distance visual function in eyes with cataract and significant corneal astigmatism, although there was a small trend toward undercorrection related to misalignment of treatment.

lass=""h4"">Financial Disclosure

No author has a financial or proprietary interest in any material or method mentioned.