New bi-toric trifocal lens performs well in study

ISTANBUL — Results of a multicenter, prospective study showed that the new bi-toric trifocal AT LISA 939MP from Carl Zeiss Meditec effectively corrects presbyopia and astigmatism after cataract and refractive lens exchange.

Three centers connected with the International Vision Correction Research Centre of Heidelberg University, Germany, participated in the study.

“So far, 26 eyes of 28 patients have been included since November 2013,” Florian Kretz, MD, said at the winter meeting of the European Society of Cataract and Refractive Surgeons.

Preoperatively, patients underwent monocular and binocular visual acuity measurement at near, intermediate and distance, corrected and uncorrected. The Salzburg Reading Desk for near and intermediate was also used to assess reading acuity. The new lens has toricity on both the anterior and posterior surface, a near addition of +3.33 D for a comfortable reading distance, and an intermediate and an addition of +1.66 D to perform most daily activities.

“Distances are well set around 40 cm for near and 80 cm for distance monocularly. Binocularly and distant corrected, the intermediate focal point seems to shift to around 72 cm,” Kretz said.

Good functional results were obtained at all distances. A high degree of spectacle independence and high patient satisfaction were reported.

Good rotational stability with deviation of 1° in a range of 1° to 10° was also reported. – by Michela Cimberle

Disclosure: Kretz reports he receives research grants from Carl Zeiss Meditec.