Posters

New concept of bifocal intraocular optical system (BIOS)

Poster Details

First Author: T.Galeev RUSSIA

Co Author(s):    S. Kuznetsov   R. Galeev                 

Abstract Details

Purpose:

Theoretical foundation of a conceptually new design of a BIOS capable of simultaneous providing intraocular correction of aphakia at different distances and recovering shape of native lens.

Setting:

Standard Clinic Penza LLC Department of Ophthalmology, Penza Institute for Further Training of Physicians – Branch Campus of the Federal State Budgetary Educational Institution of Further Professional Education «Russian Medical Academy of Continuing Professional Education» of the Ministry of Healthcare of the Russia, Penza, Russia

Methods:

The designed model of BIOS is “open-bag device” and consists of two endocapsular IOLs with elastic plate torsion haptics (PTHIOL): the main lens, located on the posterior capsule and calculated for distance, and an additional one, located on the anterior capsule, calculated for near. The additional PTHIOL contains a small-aperture hole of 1.25-1.5 mm in diameter in the center of the optical part. During implantation, the optical power of the main and additional PTHIOLs is added together and provides a correction for near. Wherein, both PTHIOL don’t contact and are perpendicular to each other in the capsular bag (CB) vaults.

Results:

The concept of BIOS is hybrid and combines the refractive zoning and small-aperture hole through which has an extended depth of focus (EDOF), acquiring multifocal properties. The edges of the small-aperture hole are limited by defocusing area of the additional PTHIOL. The haptics parameters exclude their contact with each other, but ensure maximum contact with the CB, preventing growth of epithelial cells. The BIOS fills the CB to prevent secondary cataracts and vitreoretinal complications. Additional PTHIOL can be negative or toric and be implanted both simultaneously and in a remote period due to the independence of the BIOS components fixation.

Conclusions:

The proposed BIOS hybrid concept maximally recovers the properties of the native lens both in aspects of providing vision at different distances and its shape. Its use is directed to prevention of secondary cataracts and vitreoretinal complications. The BIOS should be expected as devoid of pupillary dependence and loss of contrast sensitivity. All this, as well as the endocapsular position of the BIOS and its compliance with modern requirements of microinvasive surgery allow consider it as very promising.

Financial Disclosure:

None