Friedrich-Alexander-Universität Erlangen-Nürnberg

Development of technological fundamentals for the later development and manufacture of optimized phakic intraocular lenses

Development of technological fundamentals for the later development and manufacture of optimized phakic intraocular lenses

Presbyopia is a disease of the human eye which affects mainly older people. Presbyopia means that the ability of the eye to accommodate and to focus on near objects is reduced. The most common reason for this is a decrease of the elasticity of the human eye lens with age. The conventional treatment is the use of reading glasses. This solution, however, is not very comfortable to use so other approaches might be preferred. A possible alternative is the use of phakic, multifocal intraocular lenses (IOLs). Phakic IOLs are implanted in front of the natural eye lens so they correct the refraction of the eye. To correct presbyopia, these lenses must be multifocal as shown in Fig. 1.

Fig. 1: Schematic design of an intraocular multifocal lens

Today, multifocal IOLs are produced by diamond turning. However, this shaping technique has certain disadvantages like long machining times and thermal stress in the material. IOL-polymers can be structured by ultrashort laser ablation, so therefore a novel manufacturing process based on this approach could be implemented. Such a process would have to provide a sufficient quality, e.g. low surface roughness, but it would also require an efficiency which allows for economical production of IOLs. Therefore, we are investigating the ablation behavior of current IOL materials regarding ablation rates and efficiency.

Fig. 2: Scheme of the experimental setup

Publications:

J. Heberle, F. Klämpfl, U. Quentin, I. Alexeev, M. Schmidt: Picosecond laser ablation behavior of IOL-Materials, 7th Russian Bavarian Conference on Biomedical Engineering, Erlangen (Germany), October (2011)

Mission

SAOT provides an interdisciplinary research and education program of excellence within a broad international network of distinguished experts to promote innovation and leadership in the areas

Optical Metrology
Optical Material Processing
Optics in Medicine
Optics in Communication and Information Technology
Optical Materials and Systems
and Computational Optics.