Latest Research on Intraocular Lens : May 2020

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Latest Research on Intraocular Lens : May 2020

May 9, 2020 Ophthalmology 0

Intraocular lens providing accomodation

An intraocular lens that provides accommodation in direct response to contraction and relaxation of the ciliary body. The lens includes a first component having fixed refractive power and a second component having varying refractive power, the components being relatively movable towards each other as the ciliary body contracts to increase the total refractive power of the lens. [1]

Focussable intraocular lens
An intraocular lens that provides accommodation in response to contraction and relaxation of the ciliary body. Accommodation is achieved by motion of the lens, or of an element of a lens system, alternately toward and away from the fovea. Means are provided for biasing the lens, or the movable element, toward the fovea so that when the ciliary body is fully relaxed the lens is at its closest position to the fovea, and as the ciliary body contracts it counters the bias and causes the lens to move away from the fovea and toward the cornea. [2]

Accommodating intraocular lens

An accommodating intraocular lens apparatus preferably includes a lens member having a relatively flexible portion and a relatively rigid portion, with a fluid-filled chamber therebetween. The preferred intraocular lens also includes a hydraulic or other fluid accommodation provision for changing the shape or position of the flexible lens by changing the fluid pressure in the fluid-filled chamber in response to muscle movement of the eye. [3]

A New Method for Calculating Residual Astigmatism Produced by Toric Intraocular Lens Rotation

Aims: To report a new method for calculating residual astigmatism when exact and inexact cylinder power toric intraocular lenses (IOLs) are rotated.

Methodology: Using Excel spreadsheets and sin2θ values, we expressed the cylinder powers of toric IOLs in percentage terms compared to corneal astigmatic powers and calculated values for various corneal astigmatisms and toric IOLs. From these values, we created charts of residual astigmatic powers and axes demonstrating the results of IOLs ranging from 50% to 150% and rotated 0º to 30º. [4]

A Comparison of Accommodation Amplitudes of Three Different Acrylic Intraocular Lenses

Aim: To assess the accommodative amplitudes of three different foldable acrylic intraocular lenses (IOLs) by measuring with photorefractor Plusoptix CR03 (Plusoptix GmbH, Nuernberg, Germany).

Methods: Fifty five pseudophakic eyes of 46 patients (mean age 65.25±10.63 years) were analyzed one month after uneventful phacoemulsification and IOL implantation surgery. Rayner Centerflex (C-Flex) (n=17), AcyrSof MA60BM (n=17), Sensar AR40e (n=21) IOLs were implanted. An objective, dynamic measurement technique with R mode of Plusoptix CR03 device was used to measure accommodation. Accommodation was measured at near distance (0.33m) and far distance (5m). [5]

Reference

[1]  Turley, D.F., Turley Dana F, 1990. Intraocular lens providing accomodation. U.S. Patent 4,892,543.

[2] Levy, C.F., Levy Chauncey F, 1983. Focussable intraocular lens. U.S. Patent 4,409,691.

[3] Christie, B.A., McMaster, B.M. and Blaker, J.W., Storz Instrument Co, 1990. Accommodating intraocular lens. U.S. Patent 4,932,966.

[4] Yae, Y. and Kubota, T. (2014) “A New Method for Calculating Residual Astigmatism Produced by Toric Intraocular Lens Rotation”, Ophthalmology Research: An International Journal, 2(6), pp. 368-377. doi: 10.9734/OR/2014/12067.

[5] Yağcı, R., Erdurmuş, M., Emrah Altıparmak, U., Aydın, B., Feyzi Hepşen, I. and Duman, S. (2014) “A Comparison of Accommodation Amplitudes of Three Different Acrylic Intraocular Lenses”, Ophthalmology Research: An International Journal, 2(6), pp. 418-423. doi: 10.9734/OR/2014/12038.

 

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