ABERRATION-FREE IOL

The MicroCryl® aspheric IOL (MC 6125 AS, Human Optics) can provide cataract patients with predictable visual outcomes with a good quality of vision, said Florian Niklas Auerbach MD, University of Heidelberg, Heidelberg, Germany.

“Our findings show that implantation of the MicroCryl aspheric IOL provides good and predictable functional results, and stray light does not adversely affect patients’ vision. There is on average, a slight amount of negative spherical aberration,” Dr Auerbach told the XXXI Congress of the ESCRS in Amsterdam. (Auerbach FN, Fitting A, Khoramnia R, Rabsilber TM, Holzer MP, Auffarth GU).

One-piece design

The new aberration-free lens has a one-piece design. It is composed of hydrophilic acrylate material. The IOL has an overall length of 12.5mm, and its optic has a diameter of 6.0mm and a 360-degree square-edge profile. The lens is available in powers from +10.0 to +30.0 D in 0.5 D increments, and from -10.0 D to +50.0 D in 1.0 D increments, Dr Auerbach said.

He presented the preliminary results of a prospective study involving 20 eyes of 14 cataract patients with a median age of 63 years who underwent implantation of the MicroCryl IOL.

The patients had a median preoperative sphere of +0.25 D, and a median preoperative cylinder of -0.38 D. All underwent phacoemulsification and implantation of the IOL with a median power of +21.5 D and values ranging from +16.5 D to -29.5 D. IOL power was calculated with the Holladay I formula.

At a follow-up of two to four months after surgery, the median achieved refraction was +0.13 D. The median difference between achieved and intended spherical equivalent was +0.46 D, with values ranging from -0.57 D to +1.08 D. In addition, 25 per cent were within 0.25 D of target refraction and 50 per cent were within 0.5 D and 90 per cent were within 0.75 D.

Visual acuity

With regard to visual outcomes, uncorrected distance visual acuity had a median value of 0.02 logMAR and ranged from 0.34 to -0.12 logMAR. Median corrected distance visual acuity improved from 0.2 logMAR preoperatively to -0.14 logMAR postoperatively, with values ranging from -0.28 to 0.06 logMAR.

In terms of visual quality, wavefront analysis performed with the Zywave II aberrometer (Bausch + Lomb) showed that the median total higher order aberration RMS at a pupil size of 6.0mm was +1.14 µm. Spherical aberration had a median value of -0.34 µm and ranged from -0.73 to +0.23 µm. In addition, stray light analysis with the C-Quant (Oculus) and contrast sensitivity testing with the FACT chart showed values within normal range for both parameters. Furthermore, in their responses to a questionnaire, all patients said that they were satisfied with the results of their surgery and that they would recommend this surgery and this IOL to a relative or friend.

Gerd U Auffarth MD, FEBO, Florian N Auerbach MD, International Vision Correction Research Centre (IVCRC) Department of Ophthalmology, University of Heidelberg, Germany.

IVCRC has received Research grants and travel reimbursements from Dr Schmidt, Inc., Erlangen, Germany.
Augenklinik@med.uni-heidelberg.de