Unit 1 Flashcards
Truncation is used to stabilize what type of lenses?
Bifocal
A flat curve will have a longer or shorter radius of curvature?
Longer
What is used to thin the edge of a high minus lens?
Hyperflange
What material would represent a soft lens?
Hydroxyethylmethcrylate
Who is most responsible for the INTRO of SOFT CL?
Wichterle (1960)
When did soft lenses become available in the USA?
1971 FDA approved via B&L
Who developed the first keratoconus lens?
Kalt (1888)
Who is most responsible for PLASTIC CORNEAL CL?
Tuohy (1947)
What would be used to solve fitting problems created by excessive corneal astigmatism?
Bitoric Lenses
What, along with posterior optical zone size determines the lens VAULT.
Base curve
What is prism ballast?
Base down prism to control position and movement of toric/mf lenses.
Who conceived the idea of CL?
Davinci (1508)
Who developed therapeutic bandage CL?
Galezowski (1886)
To INCREASE vault…
Steeper curves, larger diameter.
To DECREASE vault…
Flatter curves, smaller diameter.
Curve between the base curve and peripheral curve.
IPC, secondary or intermediate curves
Outermost curve of the back surface of a lens.
PPC, Peripheral curve
Blends junction between CPC, IPC, and PPC
Blend curve
Central curve on the posterior lens surface.
CPC, base curve.
Diameter: width edge to edge.
RGP 7.0-10.5
Soft 12.5-16.0
Center thickness (CT)
Measured at geometric center.
Who thought of making a mold of the eye?
Herschel 1827.
