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Accommodative intraocular triplet lens
Session Title: New IOLs
Session Date/Time: Tuesday 08/10/2013 | 16:30-18:15
Paper Time: 17:46
Venue: Elicium 1 (First Floor)
First Author: : P.Artal SPAIN
Co Author(s): : P. Artal E. Fernandez J. Marin
Standard intraocular lenses (IOLs) are designed to optimize far distance vision. Although different accommodative IOLs have been proposed, the current designs only provide a rather modest range of accommodation in the best cases. We describe here a new triplet optical design providing a wide-range of potential accommodation change that could be incorporated in an IOL.
Laboratorio de Optica, Universidad de Murcia, Spain
Many accommodating IOLs are based in the potential use of the accommodation apparatus to eventually transmit the subtle mechanical changes into an IOL able for modulating its optical power. A key issue for the success of this approach is to provide a significant change in power with small applied forces. In this direction, we explored different optical designs having a variable power sensitive to small compression forces. When incorporated in an IOL, the optical power would change in response to small variations in their equatorial diameter. Regular materials, such as acrylics and silicones, currently available for standard IOL have been employed in the study design.
A triplet-like optical structure that produces high gains between the equatorial compression and the subsequent change in lens power is proposed. The gain can be as high as 1 dioper/µm of equatorial compression allowing for large range of power changes. The proposed triplet-lens also permits the incorporation of aspheric or toric surfaces for optimizing ocular spherical aberration or correcting astigmatism. Chromatic aberration and ghost images analysis shows a similar performance to monofocal standard IOLs. The typical central thickness of the triplet is 1 mm with an optical zone of 6 mm of diameter. These geometrical dimensions and the structure of the proposed haptics might allow the implantation of the IOL through a corneal incision of 2-3 mm of diameter. The accurate control of the equatorial diameter of the accommodative IOL and its changes during accommodative efforts can be solved by using a special intracapsular ring.
An intraocular triplet lens with a wide variable power as a response to small compresions has been designed. This new lens, in combination with a capsular ring for the precise control of its equatorial diameter, may provide a large range of accommodation restorarion.