LENTIS: Large selection of IOL designs
Aspherical intraocular lenses
The imaging quality of intraocular lenses (IOL) is one of the key factors to ensure an optimal vision for patients after a cataract surgery.
Aspherical LENTIS IOL are characterized by an aberration corrective surface structure. Basis for their design is not as usual a purely spherical cornea but a slightly aspherical cornea (anticipated in the human eye). Studies have shown that the human cornea shows asphericity in respect of the statistical median. Due to this fact, Intraocular lenses, which take into account this aberration, lead to a better visual acuity and better image quality.
Figure: All aspherical LENTIS lenses are also available with violet light filter: LS-312Y and LS-313Y
LS-412Y:Oculentis' 3-piece aspheric IOL with violet light filter is by its overall diameter of 13.0 mm (optical diameter 6.0 mm) the perfect intraocular lens for the optimal sulcus fixation.
All aspherical LENTIS lenses are manufactured in the sub-micron lathing process. The square-edge design and the superior surface quality of our HydroSmart Acrylic reduce the post-surgery-cataract formation and thus the post-treatment rate. A recent study conducted by the Berlin Eye Research Institute (BERI confirms the exceptionally sharp optic edges of the LENTIS IOL for a better PCO prophylaxis. All LENTIS lenses show an excellent biocompatibility and high stability in the capsule bag.
Spherical intraocular lenses
All spherical lenses of Oculentis are manufactured with a state-of-the-art Sub‑Micron Lathing technique. Thanks to this technology, the lenses do not require additional polishing after production and thus keep their square edges. This “square edge design“ as well as the excellent surface quality lead to a lower rate of secondary cataract formation and thus reduce the need for additional treatment.
Figure: All spherical LENTIS lenses are also available with violet light filter.
Excursus about Asphericity
Spherical Intraocular Lenses
Spherical aberrations are an optical imaging error, which leads to impaired vision. External light rays are refracted more strongly than the more central rays (see figure). Therefore, not all light rays will focus on the macula (yellow spot or „point of sharpest vision“). This results in poor contrast sensitivity. Spherical intraocular lenses do not correct these aberrations.
Aspherical LENTIS Intraocular Lenses
All aspherical LENTIS intraocular lenses correct these spherical aberrations. The aspherical lens surface focuses all the light rays correctly on the macula. Thereby an optimal image on the retina is created which leads to a very good contrast sensitivity for the patient. In turn twilight vision will be improved.