Editing Keratoconus (section)

==== Hybrid lenses ====
Traditionally, contact lenses for keratoconus have been the 'hard' or RGP variety, although manufacturers have also produced specialized 'soft' or [[hydrophilic]] lenses and, most recently, silicone hydrogel lenses. A soft lens has a tendency to conform to the conical shape of the cornea, thus diminishing its effect. To counter this, hybrid lenses have been developed that are hard in the centre and encompassed by a soft skirt. However, soft or earlier generation hybrid lenses did not prove effective for every person.<ref>{{cite journal |vauthors=Rubinstein MP, Sud S |title=The use of hybrid lenses in management of the irregular cornea |journal=Contact Lens & Anterior Eye |volume=22 |issue=3 |pages=87–90 |year=1999 |pmid=16303411 |doi=10.1016/S1367-0484(99)80044-7}}</ref> Early generation lenses have been discontinued.<ref>{{cite web|url = http://www.contactlensheadlines.com/2010/06/softperm-hybrid-contact-lenses-discontinued/|title = SoftPerm Hybrid Contact Lenses Discontinued|url-status = dead|archive-url = https://web.archive.org/web/20101012170024/http://www.contactlensheadlines.com/2010/06/softperm-hybrid-contact-lenses-discontinued/|archive-date = 12 October 2010|df = dmy-all}}</ref> The fourth generation of hybrid lens technology has improved, giving more people an option that combines the comfort of a soft lens with the visual acuity of an RGP lens.<ref>Davis Robert, Eiden Barry. ''Hybrid Contact Lens Management''. Contact Lens Spectrum: {{cite web |url=http://www.clspectrum.com/article.aspx?article=104099 |title=Contact Lens Spectrum |access-date=12 October 2010 |url-status=dead |archive-url=https://web.archive.org/web/20101223025329/http://www.clspectrum.com/article.aspx?article=104099 |archive-date=23 December 2010 }}.</ref>