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First Author: A.Egorova RUSSIA
Co Author(s): A. Vasiliev
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To study the rotary stability of hydrophobic and hydrophilic toric IOLs (TIOLs) in the remote postoperative period.
Khabarovsk affiliation of R&T Eye Microsurgery complex of acad. S. Fedorov
72 patients (60 eyes) aged from 55 to 70 years were under observation. All of them had regular corneal astigmatism and underwent cataract surgery with TIOL implantation. All patients were divided into 2 groups. The first group consisted of 30 patients (38 eyes) to whom the Acrysof Toric SA 60TT (Alcon, USA) IOL, made from hydrophobic acryl was implanted. 30 patients (34 eyes) who underwent implantation of Rayner T-flex (Rayner, UK) IOL were included into the second group. Preoperative examinations and surgery were performed according to standard technologies. Dynamic observation included refractometry and slit-lamp examination was performed on the first postoperative day and three months later the operation. Rotary stability of TIOLs was evaluated at the same terms using the method of photographing of eye anterior segment with the help of photo-slit lamp (Haag Streit IM90, Switzerland) achieving maximum possible mydriasis, and matching the light ray with the position of TIOL cylinder axis. 360 degree scale was applied on the received digital picture thus determining the position of cylinder axis.
All operations and postoperative periods were uneventful. The initial preoperative of ophthalmometry indices varied from 41 to 46,5 dioptres. Astigmatism values in both groups varied from 1,75 to 4,25 dioptres. Virtually similar refraction values of operated eyes were noticed in both examination groups in the first postoperative day: spheroequivalent made from + 0,75 ?? 1,25 dioptres (0,5ḟ0,75 in the average), cylinder component from 0,5 to 1,0 dioptres (0,75ḟ0,25 in average). 3 months later the surgery the following refraction changes were noticed in 2 eyes (5,3% of cases) in the first group spheroequivalent varied from +0,5 ?? 1,5 dioptres, cylinder component was 1,0ḟ0,5 dioptres in average. In the second group in 5 eyes (14,7% of cases) the mean spheroequivalent made 0,75ḟ1,75, the mean cylinder component was 2,5ḟ1,0 dioptres. The following changes were explained by the rotation of TIOLs. The analysis of TIOL position showed that IOL has rotated on 7-10 degrees from the calculated axis in the first group, and on 10-15 degrees in the second group, which led to the changes of refraction indices. The refractometry indices coincided with preoperative meanings during all terms of observation, and made 43,75ḟ2,5 dioptres in average.
The conducted analysis of rotary stability of different types of toric acrylic IOLs showed that IOLs made of hydrophilic acryl were susceptible to postoperative rotation more often than hydrophobic acrylic IOLs. This fact, as we see it, can be explained by lesser adhesion of hydrophilic acryl IOL surface to the posterior capsule of the lens after operation. Financial Disclosure - NO