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Worksheets

NCLE practice 4 of 7

Total questions: 24

Worksheet time: 12mins

Name
Class
Date
1.

The surface wettablilty of a contact lens is referred to as the:

a)

wetting angle

b)

hydrophobia

c)

hydrophillia

d)

moisture chamber

2.

When fitting GP lenses intrapalbebrally, the fitter fits the lenses

a)

large diameter and steep base curve

b)

large diameter and flat base curve

c)

small diameter and steep base curve

d)

small diameter and flat base curve

3.

The distance between a flat surface and the back surface of the central portion of a lens is referred to as

a)

wetting angle

b)

peripheral curve width

c)

lens diameter

d)

sagittal depth

4.

A Lenticular Flange refers to the increase or decrease in anterior lens thickness to aid in lens positioning. If a high minus lens is riding too high or the edge of the lens is too thick the fitter would order a

a)

Hyperflange

b)

Myoflange

5.

A Lenticular Flange refers to the increase or decrease in anterior lens thickness to aid in lens positioning. If a high plus is riding too low, a ________ can be designed to pull the lens under the upper lid and center the lens after the blink

a)

Hyperflange

b)

Myoflange

6.

Vertexting for contact lens begins at

a)

+4.00 D

b)

+7.00 D

c)

+/-4.00 D

d)

+/- 7.00 D

7.

A change in the CPC by .05 mm will also change the anterior curve of the lacrimal lens by

a)

0.25 D

b)

0.50 D

c)

0.75 D

d)

1.00 D

8.

When the CPC is fit flatter, the tear lens creates minus sphere power, therefore

a)

SAM

b)

FAP

9.

When the CPC is fit steeper, the tear lens creates plus sphere power, therefore

a)

SAM

b)

FAP

10.

A first generation gas permeable lens

a)

PMMA

b)

Glass

c)

Haptic

11.

If you increase the Optical Zone Diameter, you increase the sagittal depth, which _______ the fit.

a)

flattens

b)

steepens

c)

has no change to

12.

If you decrease the Optic Zone Diameter, you decrease the sagittal depth, which _______ the fit.

a)

flattens

b)

steepens

c)

has no change to

13.

If you increase the diameter of a GP lens, you ____________ the fit.

a)

flatten

b)

steepen

14.

If you decrease the diameter of a GP lens, you ____________ the fit.

a)

flatten

b)

steepen

15.

If peripheral curves are widened, the POZ will decrease which will _________ the fit.

a)

tighten

b)

loosen

16.

Up to ________ diopter can be added to a GP lens modifying it in -house.

a)

1.25

b)

1.75

c)

0.00

d)

0.50

17.

Tight or loose fits refer to the

a)

Vault

b)

Movement

18.

Steep or flat refers to the lens

a)

Vault

b)

Movement

19.

The first step in GP lens design is

a)

Vertex

b)

Transpose to minus cylinder

c)

Apply SAM principle

d)

Apply FAP principle

20.

The CPC is also known as the

a)

Power Curve

b)

Fitting Curve

21.

Which of the following is NOT a hard or GP lens material?

a)

Fluorocarbon

b)

CAB

c)

HEMA

d)

PMMA

22.

Oxygen permeability is also known as

a)

OP

b)

L

c)

DK/L

d)

DK

23.

Oxygen transmissibility is also known as

a)

OT

b)

L

c)

DK/L

d)

DK

24.

Thickness is also known as

a)

GPT

b)

L

c)

DK/L

d)

DK