Module C8636, one contact lens point for optometrists and CLOs, one general point for DOs
This article is best viewed in a PDF Format.
The concept of using a material that sits directly on the cornea for optical correction dates back to Leonardo da Vinci in 1508. The first realisation did not come until almost 400 years later, in the form of a glass contact lens. Feinbloom took this to a more practical level in 1936, through the synthesis of a durable plastic hard lens, made of poly methyl methacrylate (PMMA).
This was followed 23 years later by Wichterle and Lim’s invention of the first ‘soft’ contact lens material, poly hydroxyl ethyl methacrylate (pHEMA). This material was a breakthrough and is the first of many refinements and new developments in hydrogel materials for contact lenses, which have been driven primarily by considerations of the safety and comfort of wearers.
Register now to continue reading
Thank you for visiting Optician Online. Register now to access up to 10 news and opinion articles a month.
Register
Already have an account? Sign in here