Posters

EDOF effect of bifocal intraocular optical system (BIOS). Experimental argument

Poster Details

First Author: S.Kuznetsov RUSSIA

Co Author(s):    V. Evstifeev   R. Galeev                 

Abstract Details

Purpose:

Results analysis of experimental light path simulation in monofocal and bifocal intraocular optical system (BIOS).

Setting:

¹Penza 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. ² FESBI HE «Penza State University» MES Russia. 3 Regional Eye Hospital, Russia.

Methods:

In laboratory setting, light path of laser light has been simulated on the optical bench in two optical systems - simulating mono- and bifocal IOL in the eye. As a model of bifocal IOL, we have designed BIOS, which contains a primary lens providing far-sight correction and a secondary lens providing short-sight correction and having the central small aperture hole. Both optical systems have been assembled in compliance with the optical system parameters of the eye. The outcome analysis included study of light path and depth of field parameters in mono- and bifocal systems based on photographic recording.

Results:

We have established the relevant difference both in light path of the optical systems under study and depth of field values. Unlike the monofocal optical system enabling clear definition of one focus, BIOS had a zone of minimal unaltered depth of field between near and far focuses without any defocus in between; thus, the image quality fails to deteriorate along the distance between the focuses which hereby proves that BIOS possesses a longer focusing area or EDOF effect.

Conclusions:

The optical bench experiment for light path simulation in mono- and BIOS has first proved that the latter has a longer focusing area or EDOF effect determined by the structural design combining two lenses and a small aperture hole which has been developed by means of extra lens defocus in contrast to the around-the-hole shadowing method. The BIOS concept has been experimentally grounded in terms of obtaining high near and far visual acuity as well as mid-distance visual acuity.

Financial Disclosure:

None