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Subjective and objective refraction after monofocal toric IOL implantation and alignment with an empirical method

Session Details

Session Title: Toric IOL Outcomes

Session Date/Time: Monday 07/10/2013 | 16:30-18:30

Paper Time: 17:06

Venue: Auditorium (First Floor)

First Author: : F.Camesasca ITALY

Co Author(s): :    M. Vitali   P. Vinciguerra   M. Romano        

Abstract Details


We evaluated subjective and objective refraction, and topographic astigmatism (TA) before and after implantation of a toric aspheric monofocal IOL, aligned with an empirical method based on the limbal vessels pattern.


Istituto Clinico Humanitas – Rozzano – Milan, Italy


Thirty-six eyes of of 20 cataract patients (mean age 64.35 ± 16.59) received a toric aspheric monofocal IOL (Zeiss AT Torbi 409 MP). Preoperatively, reference limbal vessels positioned in correspondance of the alignment axis recommended by the specific website software (Zeiss Z Calc) were photographed. IOL axis orientation was performed aligning the axis with these reference limbal vessels, and checking the software recommended angle, as well as the preoperative corneal topography astigmatism. Subjective refraction and TA were measured before and nine months after surgery. In-the-bag IOL orientation was determined by anterior segment photography and examination of the above mentioned reference vessels.


Mean preoperative subjective refraction was -2.29 D ± 3.63 D sph with -2.19 D ± 0.55 D cyl at 64.44° ± 72.73°. Mean TA was -1.79 ± 0.39 at 118.88° ± 73.82°. Mean SIA was -0.20 D. Postoperatively (9 ± 4 months), mean subjective refraction was -0.41 D ± 0.79 D sph with -0.25 D ± 0.44 D cyl at 93.33° ± 45.09°. Mean BSCVA and UCVA were -0.06 LogMar and -0.02 LogMar, respectively. Mean TA was -1.87 D ± 0.40 D at 134.25° ± 63.90°. Mean IOL axial orientation was at 90.83° ± 38.40°.


Patients receiving monofocal toric IOLs aligned through an empirical method reached optimal visual acuity. Mean TA was not influenced by SIA, and final refraction showed highly satisfactory correction of spherical and astigmatic defect.

Financial Interest:


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