Comparing Image Qualities Of Monofocal, Edof And Trifocal Iols

Classic intraocular lens design strives for the narrowest possible light distribution in the focal point. EDoF IOLs (Extended Depth of Focus Intraocular Lenses) deviate from this requirement and elongate the focal point into the myopic area. In contrast, diffractive trifocal lenses form sharp and high light peaks, but are overlaid by other focal points of the multifocal lens. The aim is to compare the imaging quality of the focal point of a classical aspherical monofocal lens, an EDoF lens and the distance focal point of diffractive multifocal IOL.

The Department of Ophthalmology and Optometry, Medical University of Vienna, Vienna, Austria

The Through Focus Response (light distribution along the optical axis) was determined on an optical bench for the monofocal Primus HD (OpthalmoPro) and ZCB00 (Johnson & Johnson), for the EDoF lenses ZOE (OpthalmoPro) and Tecnis Eyhance ICB00 (Johnson & Johnson) as well as for the multifocal lenses AT Lisa tri (Zeiss) and Synergy (Johnson & Johnson). The investigations were carried out with green light and an artificial cornea (spherical aberration 0.2 μm). The evaluation of the image quality was based on the determined Through Focus Response curves for 25, 50, 100 lp/mm.

 

For the monofocal lenses, a high and narrow light distribution was shown, while for the EDoF IOLs a widening of the light distribution occurred with a loss of peak height. The AT Lisa tri showed clearly separated focal points, while the Synergy showed a steady increase in light energy to a fainter near focal point after a separated focal point. The conversion for the resolution showed the smallest differences for the respective focal points examined at 25 lp/mm, while at 100 lp/mm the monofocal lens clearly showed the best result.

The qualitative differences of the investigated focal points become clear at high spatial frequencies, whereby they become detectable in particular by contrast examinations.