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New asymmetric IOL design provides vision at all distances, no disturbing photic phenomena
In one surgeon’s clinical experience, wavefront analysis showed minimal optical aberrations after implantation.
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BUDAPEST — The innovative design of the multifocal Lentis Mplus IOL provides effective presbyopia correction while maintaining natural contrast sensitivity and avoiding glare and image jumps, according to one surgeon.
 Jorge L. Alió |
“We are dealing with an entirely new IOL concept. The asymmetric design of the lens comprises a sector-shaped section of +3 D in the periphery, which is used for near vision, while the rest of the optic is powered for distance vision,” Jorge L. Alió, MD, PhD, said at the winter meeting of the European Society of Cataract and Refractive Surgeons.
Currently available multifocal lenses are based on the concept of rotational symmetry, he said. Concentric circles, either refractive or diffractive, produce images in several foci along the entire surface of the lens, in a 360° area.
“The light is scattered on the foci along the entire lens surface, with consequent loss of light, permanent overlapping images and loss of vision quality,” Dr. Alió said.
How it works
The Lentis Mplus (Oculentis) is a rotational asymmetrical lens in which light is refracted to other foci only in a specific sector, while the rest of the optic behaves as a monofocal lens.
“More light is going to the far focus, giving better contrast sensitivity. There is less duplication of images, thus less incidence of halos and glare. Picture quality is better, without light-scattering effects,” Dr. Alió said.
With the optical axis placed on the line of sight and the sector-shaped near vision zone positioned inferiorly, the lens is independent of pupil size. It is easy to adjust for binocular vision and requires minimal neuroadaptation.
“There is no image jump between the two foci along the visual axis. When the light hits the transition area to the near-vision sector, it is reflected away from the optical axis,” Dr. Alió said.
Initial results
Dr. Alió presented the results of his initial clinical experience with the Lentis Mplus in 42 eyes with a follow-up of 1 month. Visual acuity was measured for near, intermediate and distance, intraocular optical quality was evaluated using the VOL-CT software, contrast sensitivity was measured, retinal image quality was assessed with the Optical Quality Analysis System (Visiometrics), and total aberrometry was measured with the Complete Ophthalmic Analysis System (AMO WaveFront Sciences).
“All patients achieved at least 20/25 corrected far vision, including the correction of astigmatism. With the same distance correction, all patients were able to read J3, many were J2 and quite a few were J1. Intermediate vision was very good as well, around J2,” Dr. Alió said.
Some of the patients in his group use spectacles for reading, but only for astigmatic correction.
One patient spontaneously reported halos, and five were questioned regarding halos. On the whole, visual disturbances are a minor problem with this lens, he noted.
“Thanks to this light distribution, we are reducing the incidence of halos and photic phenomena at night, which is quite an achievement with multifocal lenses,” he said.
Patient satisfaction was high, with 95% of patients saying that they would have the same lens implanted again.
In objective optical tests carried out after implantation, point spread function and modulation transfer function demonstrated the image quality produced by the Lentis Mplus, showing little or no light scattering. – by Michela Cimberle
- Jorge L. Alió, MD, PhD, can be reached at Vissum, Instituto Oftalmologico, 03016 Alicante, Spain; +34-965-150025; fax: +34-965-151501; e-mail: jlalio@vissum.com.