No statistically significant difference in intermediate vision
was observed between the ReZoom-and Tecnis-implanted eyes.
This is in disagreement with results presented recently by Gatinel and Loicq  reporting optical bench measurements in the Symfony EDOF IOL compared with a bifocal and a trifocal IOL that predict a drop in modulation transfer function (MTF) for the EDOF lens at intermediate vision
for pupil sizes larger than 2 mm.
The lens has three different focal parts: for near, far and intermediate vision
Following the successful launch of lenses for near and far vision, the new IOL enables considerably im- proved intermediate vision
. This enables more natural post-operative vision than existing IOLs."
The vision system consists of subsystems with the following basic functions: early vision (selection of local objects, intermediate vision
(construction of global objects), and approximate qualitative classification of global objects selected at the intermediate stage.
To treat presbyopia, some surgeons have begun replacing the natural crystalline lens with implantable, variable-focus lenses that correct for near, distance and/or intermediate vision
. This lens replacement, which is becoming more popular as newer specialty lenses are developed, is the same approach used to treat patients with cataract, a clouding of the lens.
Both are multifocal lenses, meaning they offer correction of near vision, intermediate vision
and far vision at once.
A LASIK procedure is carried out and spherical aberration is manipulated in each eye to increase depth of focus, producing distance and intermediate vision
in one eye and near and intermediate vision
in the other eye.
Multifocal IOLs were reported to provide higher patient satisfaction due to better results for near and intermediate vision
and a greater depth of focus, due to which they appear to have higher spectacle independence and patient satisfaction than monofocal IOLs [1, 2].
“The TRULIGN Toric lens both reduces the negative impact of pre-existing astigmatism on postoperative vision and also imparts excellent distance and intermediate vision
and functional near vision, all through a single surgical procedure,” said Dr.