Purpose: To measure and evaluate the in-vivo axial lens position of a new inverted meniscus intraocular lens (ArtIOLs, Voptica SL, Murcia, Spain) which improve the overall off-axis optical quality and induce different amounts of negative spherical aberration to increase the depth of focus. The outcomes were compared with standard biconvex designs and were used to evaluate the effect on retinal image magnification.
Setting/Venue: Oftalvist clinic of Murcia, Spain; University of Murcia, Spain.
Methods: 55 and 62 eyes were implanted with ArtIOLs® 40 and 70 respectively, which had C-loop haptics. Biconvex designs were implanted in two other groups, one with C-loop haptics (19 eyes) and the other with Double C-loop haptics (20 eyes). Three months after the surgery, the aqueous depth (AQD), refers to the distance between the corneal endothelium and the anterior surface of the IOL, was measured with the Anterion OCT system (Heidelberg Engineering) using the manual option on the line of sight. The nodal points of the real eyes and the image magnifications were calculated using the software Zemax OpticStudio.
Results: There were no significant differences between the groups with the two models of ArtIOLs®. The mean values of AQD were 4.42±0.28 and 4.40±0.28 mm for ArtIOLs® 40 and 70 respectively. In eyes with C-loop biconvex IOL, the lens position was similar, 4.35±0.19 mm (p-value>0.05). However, Double C-loop biconvex IOL was significantly further away from the retina, mean AQD of 4.12±0.30 mm, which involves a small displacement around 0.10 mm towards the retina of the nodal points of the eye and a minor change of retinal image size of only 0.60 %.
Conclusions: The innovative shape of ArtIOLs® with inverted meniscus could lead us to think that these lenses were located significantly closer to retina. Nevertheless, if the type of haptics was the same, C-loop, the anterior surface of these lenses was in the same place as standard biconvex IOLs. The differences with other standard IOLs will depend mainly on haptics, but the effect on retinal image size should be negligible.