unit 1 history of contact lenses Flashcards
William Feinbloom
1936
- combined PMMA with glass (center)
- large contact lenses
Kevin Tuohy
1948
- credited with the first PMMA corneal contact lenses
-error during the lathing of PMMA scleral lens
haptic and corneal portions separated
Otto Wichterle
1972
- unable to attract support
- conducted experiments in his own house which us when he develped the spin-casting technique
- Soft contact lenses
- HEMA material
Norman Gaylord
1974
- incorporated silicone into the basic PMMA structure
- patented oxygen permeable lenses(GP lenses)
Khls Nilsson
1988
- benefits of 6 month replacement frequency
- gothenburg study proved the benefit of regular lens replacement
Leonardo DaVinci
beginning concepts
- immersing the eye in a bowl of water
Rene Descartes
beginning concepts
- fluif filled tube on the eye
Thomas Young
beginning concepts
- constructed a “fluid-filled eyecup”
Sir John Herschel
1800s
- suggested taking a mold of the cornea and impressing it on some transparent medium
F.A. Muller
1800s
- manufactures of prosthetic eyes
- fitting of a partially transparent shell of thin clear blown glass to a patient
1960s and 1970s
Baush and Lomb
- soft contact lenses commerically in the
USA
- introduced soft contact lenses in 1972
1980s
Toric Soft contact lenses
Silicone lense
- oxygen permeability and extended wear
Bifocal soft contact lenses
- coloured contact lenses
Disposable contact lenses
1990s
1994
Daily disposable contact lenses
- lauched in the UK in 1994
- Johnsone and Johnsone released the
1-Day-Acuvue
1998
Silicone Hydrogel Lenses
- Focus Night and Day (CIBA Vision)
- Purevision (Basush and Lomb)
Soft Lens Manufacture
Lathe cutting
Spin casting
Cast moulding
Lathe cutting
more expensive
custom lenses
- high spherical and/or toric powers,
karatoconus
polymer button
diamond tipped tool
- back surface lathed first
- front surface lathed
Inspection Hydration Re-inspection
inserted into vial
