Rotational stability of a new toric intraocular lens platform (Ankoris® and Finevision toric®, PhysIOL SA) after routine cataract surgery : 64 consecutive cases

Session Details

Session Title: Pseudophakic IOLs: Toric Cataract Surgery Equipment

Session Date/Time: Tuesday 08/09/2015 | 14:00-16:00

Paper Time: 14:06

Venue: Room 1

First Author: : K.Vandekerckhove SWITZERLAND

Co Author(s): :                        

Abstract Details

Purpose:

to evaluate the rotational stability of a new toric hydrophilic IOL with innovative design (double C-loop haptics). Both the monofocal (Ankoris®) and the multifocal version (Finevision toric®) were tested and compared. The monofocal and the multifocal version share an identical design. This is the first large study on rotational stability of this new toric IOL platform.

Setting:

Vista Alpina Eye Clinic, Switzerland.

Methods:

Prospective study in 64 eyes of 48 patients undergoing cataract. The monofocal IOL was implanted in 33 eyes, the multifocal in 31 eyes. IOL misalignment was measured 30', one day, one week, six weeks and six months after surgery. Further measurements included uncorrected distance visual acuity (UDVA) and manifest refraction. A dual Scheimpflug analyzer (Ziemer Galilei 6) was used for optical biometry and keratometry, as well as for photographic assessment of IOL rotation. Corneal astigmatism was calculated based on ray tracing, taking into account anterior and posterior astigmatism. Mean pre-operative corneal astigmatism was 2.15D +- 0.95 D (1.0 to 5.93D).

Results:

Residual refractive astigmatism was 0.45 D ± 0.45 D at 6 weeks. UDVA was 0.22 ± 0.18 and 0.11 ± 0.10 logMAR at six weeks in the monofocal and in the multifocal group respectively. Mean rotation from 30' to six weeks was 2.4° ± 2.8° and from 30' to six months 2.5° ± 2.7°. Absolute misalignment of the monofocal and the multifocal IOL group relative to the intended axis was 5.1° ± 5.8° and 2.8° ± 3.0° respectively (p=0.031) at six weeks. This difference appeared early, with misalignment reaching 5.1° ± 5.9° and 2.4° ± 2.4° respectively (p=0.014) after one day.

Conclusions:

The new double C-loop toric IOL platform evaluated in this study showed excellent rotational stability after cataract surgery. Despite identical design, the rotational stability of the multifocal toric IOL was significantly better than that of the monofocal toric IOL, mainly due to better rotational stability during the first hours following surgery. We hypothesise that the different surface of the multifocal IOL, including the anterior diffractive rings, prevents very early rotation through an increased friction coefficient. Both the monofocal and the multifocal IOL provided good uncorrected vision and were effective in correcting preoperative corneal astigmatism.

Financial Interest:

One of the authors receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented