Posters

Rotational stability and visual outcomes after implantation of a monofocal toric intraocular lens

Poster Details

First Author: G.Sallet BELGIUM

Co Author(s):                        

Abstract Details

Purpose:

To evaluate rotational stability and the refractive and visual outcomes of an aspheric aberration-correcting monofocal toric intraocular lens (IOL) for compensation of preexisting corneal astigmatism during routine cataract surgery.

Setting:

Ooginstituut Aalst, Aalst, Belgium.

Methods:

Monofocal toric IOLs (Ankoris, PhysIOL, Belgium) were monolaterally or bilaterally implanted after phacoemulsification in cataract patients with pre-existing corneal astigmatism. IOL cylinder power and target IOL axis were calculated using the PhysIOL toric calculator. Refraction, uncorrected (UDVA) and corrected (CDVA) distance visual acuities were measured 1 day, 1 month and 3 months postoperatively. At each follow-up visit, the axis position of the IOL was determined by evaluating images taken under pupil dilation with OPD scan Retroimage (Nidek, Japan). These values were compared to the preoperatively intended position (total misalignment) and follow-up visits to determine the IOL rotation after implantation.

Results:

Ninety-seven eyes of 75 patients (mean age 76.6±9.0 years) were assessed. IOL cylindrical power ranged from 2.25 to 6.0 diopters (D). Three months postoperatively, mean refractive cylinder decreased from -1.85±1.17 D to -0.61±0.49 D. Patients achieved a mean UDVA and CDVA of 0.11±0.16 logMAR and 0.07±0.12 logMAR, respectively. Mean absolute IOL misalignment from the intended axis was 5.10±4.60° (1 day), 6.04±4.79° (1 month), and 6.30±5.14° (3 months). At 3 months, absolute IOL rotation was within 5° in 91% of eyes.

Conclusions:

Ankoris toric IOL implantation is an effective and reliable option to correct preexisting astigmatism in patients undergoing cataract surgery. The lens shows good and stable visual performance and rotational stability over a 3-month follow-up. With respect to the double-C-loop haptics design, the IOL rotation after implantation is minimum and well within the allowed limits given in ISO norms (ISO 11979) on toric lenses. As expected, the total misalignment was higher compared to the absolute IOL axis rotation, indicating that the perfect orientation of toric IOLs is a very critical part in cataract surgery.

Financial Disclosure:

research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented