Evolution of High Precision Manufacturing of Contact Lenses

Abstract:

Today’s contact lens professionals must familiarise themselves with the various contact lens manufacturing methodologies that are capable of producing high accuracy optical products for their patients. Contact lens manufacturing dates back to the 19^th century with the development of glass contact lenses and later evolved to various types of optical polymeric materials. The recent advances in the manufacturing of contact lenses can be attributed to the development of advanced polymeric materials and high precision processing technologies. Two basic techniques are identified for contact lens manufacturing. They are moulding method and ultra-high precision machining. Ultra-high precision machining is employed for direct shaping of contact lenses or for making mould inserts that will be used further in lens injection. Mould inserts can be made from high hardness steel, nickel plated steel, aluminium or other nonferrous alloys. Advanced light metal optical aluminium alloys provide a high integrity mould with fine microstructures for optical lens production. This review paper provides a chronological view of the evolution of contact lens manufacturing and identifies the importance of a recently developed aluminium alloy in the production of mould inserts for high quality contact lenses.

• Periodical: Materials Science Forum (Volumes 828-829)
• Pages: 374-380
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.828-829.374
• Online since: August 2015
• Authors: Oluwole A. Olufayo, Khaled A. Abou-El-Hossein*
• Keywords: Contact Lens Manufacturing, Polymer Diamond Turning, Ultra-High Precision Manufacturing

References

[1] M.F. Refojo, editor, Polymers and Devices in Ophthalmology, 1995: IEEE.

[2] N. Efron, Contact lens practice: Elsevier Health Sciences; (2010).

[3] A.P. Selby, Nanoindentation of soft contact lens materials, University of Manchester, (2012).

[4] M. Heinrich, C. Wildsmith, editors. Need for precision engineering in astigmatic contact lenses. Proceedings of the ASPE Topical Meeting on Freeform Optics, (2004).

[5] L. Dick, S. Risse, A. Tünnermann, Injection molded high precision freeform optics for high volume applications, Advanced Optical Technologies, 1 (2012) 39-50.

DOI: 10.1515/aot-2011-0009

[6] E. Brinksmeie, R. Glaeb, J. Osmer, Surface integrity demands of high precision optical molds and realization by a new process chain, Procedia Engineering 19 (2011) 40-43.

DOI: 10.1016/j.proeng.2011.11.077

[7] M.S. Chunning Huang, Investigation of injection molding process for high precision polymer lens manufacturing, The Ohio State University, (2008).

[8] D. Bourque, Manufacturing plastic injection optical molds. Optical Engineering+ Applications; International Society for Optics and Photonics, (2008).

[9] G. Gubbels, L. Tegelaers, R. Senden, Melt spun aluminium alloys for moulding optics. SPIE Optifab, International Society for Optics and Photonics (2013).

DOI: 10.1117/12.2030181

[10] K. Abou-El-Hossein, O. Olufayo, Z. Mkoko, Diamond tool wear during ultra-high precision machining of rapidly solidified aluminium RSA 905, Wear 302(1-2) (2013) 1105-12.

DOI: 10.1016/j.wear.2012.12.060

[11] G. Chapman, Ultra-precision machining systems; an enabling technology for perfect surfaces, Moore Nanotechnology Systems, (2004).

[12] W. Chiu, W. Lee, Development of ultra-precision machining technology, 5th International Conference on The Technology Exploitation Process, (1997).

DOI: 10.1049/cp:19970187

[13] J. Franse J. Manufacturing techniques for complex shapes with submicron accuracy. Reports on Progress in Physics. 53(8) (1990) 1049.

DOI: 10.1088/0034-4885/53/8/002

[14] O. Rieme, Advances in ultraprecision manufacturing, Proc Jpn Soc Precis Eng, (2011).