Optical design and performance of a trifocal sinusoidal diffractive intraocular lens

Abstract

Two theoretical sinusoidal diffractive profile models to build up a trifocal intraocular lens (IOL) are analysed. Topographic features of the diffractive zones such as their shape, step height and radii, as well as the energy efficiency (EE) of the foci, depends on the particular model, and are compared to the ones experimentally measured in a trifocal lens that claims to be designed with a generic sinusoidal diffractive profile: the Acriva Trinova IOL (VSY Biotechnology, The Netherlands). The topography of the IOL is measured by confocal microscopy. The EE is experimentally obtained through-focus with the IOL placed in a model eye. The experimental results match very accurately with one of the theoretical models, the optimum triplicator, once that a spatial shift in the sinusoidal profile is introduced in the model.

Comparison of Sinusoidal Vision Trifocal Intraocular Lens(IOL) with Monofocal Extended Depth of Focus (EDOF) IOL After Cataract Surgery

“…In the study of Chiam et al, moderate glare was observed in 21.3% of eyes implanted with Acrysof ReSTOR IOL and 7.5% of eyes implanted with monofocal Acrysoft A60AT IOL. While there were complaints of halo in 16 (16.3%) eyes with Acrysof ReSTOR IOL, halos were reported in two eyes with (3.8%) monofocal IOL [4]. In the study of trifocal IOLs, including FineVision (PhysIOL SA, Liège, Belgium) and PanOptix IOL, halos were reported in 60% of the patients, even though at different degrees [20].…”

“…However, studies with EDOF IOLs have shown that they do not provide su cient near vision as multifocal IOLs do [3]. The newly available sinusoidal vision trifocal IOLs are designed with stepless waves, unlike the other trifocal IOLs, promises higher light transfer to the retina, wider focal depth, optimum light distribution, less chromatic aberrations and fewer photopsy complaints [4]. Both novel lens designs aim to provide a continuous vision with less subjective visual complaints.…”

Analysis and comparison of monofocal, extended depth of focus and trifocal intraocular lens profiles

“…The basic principle behind these lenses is to extend the range of focus above a defined functional visual acuity threshold to provide useful distance and intermediate vision with monotonically decreasing visual acuity from the best distance focal point 4 . New high order aspheric surface designs have been developed to obtain this focus elongation 1 , 2 . All these advances in lens design have increased the complexity of lens surface fabrication.…”

“…In most cases this control has been done by designing optical setups to determine parameters related to the optical quality of the IOL. Parameters as the as Modular Transfer Function (MTF), Point Spread Function (PSF) or Strehl ratio have been used for this purpose 2 , 5 – 8 . A combination of optical bench measurements and simulations was developed by Camps et al in order to obtain the same parameters but with the advantage of using real data patients in these simulations 5 , 6 , 9 .…”

“…A less explored possibility to control the optical quality of the IOLs is to measure the profile of both surfaces. Some authors that studied or proposed new IOLs designs used this method to experimentally check the IOL profile 2 , 3 , 10 , 11 . Recently Tognneto et al used a profilometric technique in different commercial IOLs.…”