ROTATIONAL STABILITY AND CENTRATION OF A TORIC LENS USING THE ITRACE TECHNOLOGY

To determine the rotational stability of the Asqelio Toric Monofocall
intraocular lens (IOL) (AST, Boston, Masschusets) using objective image and
Itrace (Tracey, Houston, Texas) technology.

the estudy was done at Hotpital La Fe, Valencia, Spain

A total of 30 patients (mean age: 69 ± 8.5 years) with healthy eyes and
astigmatism in biometrics > 3 Prismatic Diopters (PD), presenting cataract
surgery were implanted monocularly with the Asqelio Toric Monofocal IOL and
followed up to 90 days postoperatively. Images of the IOL were captured with
the Itrace technology through a maximally dilated pupil immediately after
surgery and after 1 to 3 days, 30 days, and 90 days. Centering of the IOL
were analyzed with Itrace technology through angle kappa and alpha
distance and the tilt of the IOL through the measurement of the coma.

Absolute values for centering of the IOL postoperatively were related to angle
kappa positive in all cases, ranging from +1° to +5°. The mean angle kappa
was 2.68° and 2.10° in the right and left eye, respectively. Different subjective
perception of photic phenomena between the two eyes was recorded only in
2 patients. Wave aberration measurements of the same IOL were highly
repetitive (deviation <0.02 μm). Coma increased with decentration at a rate of
0.18 μm / mm and 0.19 μm in the right and left eye, respectively.

The Asqelio Monofocal Toric IOL showed good rotational stability after
implantation. The measurements with the Itrace technology suppose a perfect
system for evaluate the postoperative centering and the tilt of the lens
assuming an improvement of the visual quality of the patient.