Toward the aspects of posterior capsular opacification development in pseudophakia with plate haptic lenses

Abstract
Toward the aspects of posterior capsular opacification development in pseudophakia with plate haptic lenses
S.L. Kuznetsov1, T.R. Galeev1, T.V. Silnova2, G.G. Uzunyan3
1The Penza Institute for Postgraduate Medical Studies of Roczdrav ;
2The N.A. Semashko Municipal Hospital, Penza;
3The S. Fyodorov Eye Microsurger y Federal State Institution, Moscow

Purpose. Comparative analysis study of posterior capsule opacification (PCO) incidence depending on the capsular bag (CB) size and the plate haptic lens (PHIOL) parameters.

Material and methods. Material of this paper is a retrospective analysis of the PCO incidence in 243 patients, who between 2001 and 2010 underwent the cataract extraction with implantation of PHIOL RSP-2 of a 10.7mm size made of collagen copolymer. All operations were performed according to the small incision technology without complications. In addition to conventional methods the examination included a pre-operative determination of the CB diameter, both by calculation and visualization using ultrasound biomicroscopy (UBM). All patients were divided into three groups with CB size <PHIOL size, ≈PHIOL size and <PHIOL size. Follow-up was from 1 to 10 years.

Results. The PCO frequency during the observation period was 33 cases or 13.58%, and YAG laser posterior capsulectomy was required in 24 cases (9.88% of the entire group; 72.73% of patients with PCO). It was noted that the frequency of PCO in patients with CB<PHIOL was 10 times less than in the group with the CB>PHIOL, which can be attributed to a decrease or absence of the RSP-2 lens haptic elements posterior deflection and a reduction in the contact tightness between its optical part and the CB in its largest sizes.

Conclusions. Traditional PHIOL designs can not guarantee a tight contact of lens with the CB, particularly in the joints of IOL haptics to its optical part. The maintenance of the space between them is a promoting aspect of PCO development. Contact tightness of PHIOL optical part with the posterior capsule of CB depends on the ratio of CB and PHIOL sizes, as well as the IOL design, that requires determination and consideration of the CB original diameter in selection of PHIOL size and model.
Key words: pseudophakia, PHIOL, posterior capsular opacification, cataract surgery complications, intraocular lens design.

Ophthalmosurgery.— 2011.— No. 2.— P. 64-68.