Research accommodating lens

24-Mar-2020 07:57 by 8 Comments

Research accommodating lens

Marchini et al reported the mean anterior axial movement of 20 crystalens IOLs to be only 0.33 ± 0.25mm 2004;76-2482).

The Morcher Bio Com Fold Type 43E, Human Optics 1 CU, Lenstec Tetra Flex, and eyeonics crystalens are examples of single-optic IOLs.A more recent study further questioned the validity of this lens’s mechanism of action by demonstrating a mean 151 micron backward shift of the crystalens with pilocarpine 2% instillation Despite a lack of evidence supporting substantial axial movement of the crystalens, data from FDA clinical trials revealed that 26% of patients implanted bilaterally with this IOL were able to function completely without glasses, and 74% of patients were able to function either completely or mostly without glasses.These findings suggest that the accommodating crystalens is a viable alternative to multifocal IOLs in the appropriate patient.The Nu Lens accommodating IOL is designed to change its true power during accommodation and has been shown in an animal model to deliver over 40 D of accommodation.The Nu Lens incorporates a small chamber of silicone gel and a posterior piston with an aperture in its center that allows the gel to bulge relative to the forces generated by accommodation (Figure 6).Not only will this enhance cataract surgery results, but it will also enable refractive surgeons to offer their patients a procedure that is unhindered by the restrictions of corneal refractive surgery and presbyopia.

Accommodating lenses can currently be classified into 3 categories: (1) single-optic, (2) dual-optic, (3) and deformable optic IOLs.

These types of lenses change their true power during accommodation, and hold the promise of providing higher amplitudes of power change than can be currently achieved with single and dual-optic accommodating lenses.

Deformable IOLs are, for the most part, in the preliminary stages of development and animal research.

The Medennium Smart IOL is a hydrophobic, acrylic IOL that has dimensions (9.5 x 3.5 mm) similar to the natural crystalline lens.

The lens is unique, because it is packaged as a thin, solid rod that can be inserted into the eye at room temperature through a microincision (Figure 5).

One of the consistent findings in accommodative IOL studies is a disconnect between the measured axial movement of the IOLs and the unaided near acuities.