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Abstract:
Conventional contact lenses are simple polymer structures primarily used for the correction of vision. The integration of function into the structure of a contact lens opens a number of intriguing venues such as incorporation of a semi-transparent display directly on the structure of a contact lens or the inclusion of a bio-sensor directly on the surface of the cornea. Contact lens have been tested and used biocompatible for use in a rabbit eye [1].

Contact lens with integrated inorganic semiconductor device

Napoli, Italy | Posted on August 24th, 2009

After the experiment we are try to install the electronic circuit on a contact lens for use human. The integration on contact lens with embedded electronics, optoelectronics, or sensors, in addition to vision correction, can act as a head-up display (HUD) or a medical sensing instrument. Automakers have begun incorporating HUDs into their cars for the purpose of displaying data such as vehicle speed directly onto the windshield. The idea is to create a safer driving experience by allowing the driver to stay focused on the road while having all pertinent information directly in his field of vision [1].
All HUD systems in use today require sizeable pieces of equipment that are not very portable and infringe on the user's mobility. By placing portions of a HUD system onto a contact lens, and precisely LED (light emitting diode) display, on the contact lens, it is possible to create a system that is compact, portable, and discrete.
The same benefits can be realized when using the contact lens as a medical instrument. Glucose sensors for example, among other sensors, can be placed onto the contact to provide early warnings to diabetics.
Contact lens with integrate display can give information of the viability, by HUD's, to the driver.
Video-game companies could use the contact lenses to completely immerse players in a virtual world without restricting their range of motion [1]. We offer a set of technique based on self-assembly here that allow for incorporation of various functions onto a contact lens.
Contact lens is made of polyethylene terephthalate (PET) that is a thermoplastic polymeric resin used for synthetic fibre, member of the family of polyesters that are a class of polymers that contained a ester group in their main chain.
Such an integrated device would presently have a wide range of uses for biological and chemical analysis and may open doors for new applications in the future. Final platform is composted of unconventional substrate utilizing simply fabrication technique and common materials such as plastic or glass used to fluorescence detection that is the primary method of molecular sensing and characterization in biology today.
After the self-assembly process, the surface is encapsulated with a biocompatible material, polymethyl methacrylate (PMMA). Once passivated, the flat substrate with embedded electronics is placed into a heated aluminum mold and pressed so that a permanent curvature is imparted onto the plastic creating the contact lens. The lens is then sterilized and tested in a rabbit's eye that represent animal model of this experiment.
Bibliography

[1] Contact lens with integrated inorganic
semiconductor devices Ho, H. Saeedi, E. Kim,
S.S.Shen, T.T. Parviz, B.A.
Micro Electro Mechanical Systems
IEEE 21st International Conference on 403-406 Jan. 2008
[2] S.A. Stauth, B.A. Parviz, "Self-assembled singlecrystal
silicon circuits on plastic", Proceedings of the
National Academy of Sciences, vol. 103, pp. 13922-
13927, 2006.
[3] S.S. Kim, E. Saeedi, D.R. Meldrum, B.A. Parviz, "Self-
Assembled Heterogeneous Integrated Fluorescence
Detection System", proceedings of the 2nd Annual
IEEE International Conference on Nano/Micro
Engineered and Molecular Systems, pp. 927-931, 2007.
[4] B. Monemar, K.K. Shih, G.D. Pettit, "Some optical
properties of the AlxGa1-xAs alloy system", Journal of
applied physics, vol.47, no.6, 1976.
[5] X. Wu, L. Coldren, J. Merz, "Selectrive etching
characteristics of HF for AlxGa1-xAs," Electronics
Letters, vol. 21, pp 558-559, 1985.
[6] Ehsan Saeedi1*, Samuel S. Kim1, James R. Etzkorn,
Dierdre R. Meldrum2, Fellow, IEEE, and Babak A. Parviz1
Automation and yield of micron-scale self-assembly processes
IEEE Conference on Automation Science and Engineering
Scottsdale, AZ, USA, Sept 22-25, pp. 375-380, 2007.

Dott. Giovanni Romano
University Federico II Naples Italy