Medical Lasers; Engineering, Basic Research, and Clinical Application  
Rotational Stability of AcrySof Toric Intraocular Lens Over Time: Influence of Capsulorhexis Contraction
Joong Hee Kim, Kyong Jin Cho
Department of Ophthalmology, Dankook University College of Medicine, Cheonan, Korea
Correspondence to: Kyong Jin Cho
Department of Ophthalmology, Dankook University Hospital, #201 Manghyang-ro, Dongnam-gu, Cheonan 31116, Korea
Tel.: +82-41-550-3945
Fax: +82-41-556-0524
E-mail: perfectcure@hanmail.net
Received: March 24, 2020; Accepted: March 30, 2020; Published online: April 13, 2020.
© Korean Society for Laser Medicine and Surgery. All rights reserved.

Abstract
Background and Objectives
To evaluate the rotational stability of AcrySof toric intraocular lenses (IOL) by considering lapse of postoperative time and influence of capsulorhexis contraction.
Materials and Methods
A prospective, masked, single center study was conducted on 19 patients who had undergone microcoaxial cataract surgery and AcrySof toric IOL implantation. Slit-lamp retroillumination photographs of anterior segments were obtained from all patients after 1 week, 1 month and 3 months postsurgery. The degree of alteration of the postoperative IOL axis alignment and the amount of anterior capsular shrinkage were analyzed using Adobe Photoshop software.
Results
The mean degree of toric IOL axis misalignment was 2.18 (±20.2) degrees at 3 months follow-up. Quadrant analysis of the capsulorhexis aperture area at 1 week and 1 month post-operative, showed counterclockwise IOL rotation when the capsule contraction was dominant in the haptic part as well as clockwise rotation when dominant in the non-haptic part (p= 0.015).
Conclusion
The direction and degree of AcrySof toric IOL rotation differed throughout the follow-up period. Since most misalignments were found on the first post-operative day, physicians should try to minimize peri-operative risk factors that influence IOL rotation. There was also a correlation between the part of anterior capsule contraction and the direction of IOL rotation.
Keywords: Capsulorhexis contraction; Rotational stability; Toric intraocular lens


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