Unit 1

Question 0

Truncation is used to stabilize what type of lenses?

Answer 0

Bifocal

Question 1

A flat curve will have a longer or shorter radius of curvature?

Answer 1

Longer

Question 2

What is used to thin the edge of a high minus lens?

Answer 2

Hyperflange

Question 3

What material would represent a soft lens?

Answer 3

Hydroxyethylmethcrylate

Question 4

Who is most responsible for the INTRO of SOFT CL?

Answer 4

Wichterle (1960)

Question 5

When did soft lenses become available in the USA?

Answer 5

1971 FDA approved via B&L

Question 6

Who developed the first keratoconus lens?

Answer 6

Kalt (1888)

Question 7

Who is most responsible for PLASTIC CORNEAL CL?

Answer 7

Tuohy (1947)

Question 8

What would be used to solve fitting problems created by excessive corneal astigmatism?

Answer 8

Bitoric Lenses

Question 9

What, along with posterior optical zone size determines the lens VAULT.

Answer 9

Base curve

Question 10

What is prism ballast?

Answer 10

Base down prism to control position and movement of toric/mf lenses.

Question 11

Who conceived the idea of CL?

Answer 11

Davinci (1508)

Question 12

Who developed therapeutic bandage CL?

Answer 12

Galezowski (1886)

Question 13

To INCREASE vault…

Answer 13

Steeper curves, larger diameter.

Question 14

To DECREASE vault…

Answer 14

Flatter curves, smaller diameter.

Question 15

Curve between the base curve and peripheral curve.

Answer 15

IPC, secondary or intermediate curves

Question 16

Outermost curve of the back surface of a lens.

Answer 16

PPC, Peripheral curve

Question 17

Blends junction between CPC, IPC, and PPC

Answer 17

Blend curve

Question 18

Central curve on the posterior lens surface.

Answer 18

CPC, base curve.

Question 19

Diameter: width edge to edge.

Answer 19

RGP 7.0-10.5

Soft 12.5-16.0

Question 20

Center thickness (CT)

Answer 20

Measured at geometric center.

Question 21

Who thought of making a mold of the eye?

Answer 21

Herschel 1827.