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In this work, we propose a new diffractive trifocal intraocular lens designwith focus extension, conceived to provide a high visual performance atintermediate distances. This design is based on a fractal structure known asthe "Devil's staircase". To assess its optical performance, numericalsimulations have been performed with a ray tracing program using theLiou-Brennan model eye under polychromatic illumination. The simulated throughthe focus visual acuity was the merit function employed to test itspupil-dependence and its behavior against decentering. A qualitative assessmentof the multifocal intraocular lens (MIOL) was also performed experimentallywith an adaptive optics visual simulator. The experimental results confirm ournumerical predictions. We found that our MIOL design has a trifocal profile,which is very robust to decentration and has low degree of pupil dependence. Itperforms better at intermediate distances than at near distances and, for apupil diameter of 3 mm, it works like an EDoF lens over almost the entiredefocus range.

Optical performance of a new design of trifocal intraocular lens based on the Devil's diffractive lens