NEW
Font size
WorksheetsNCLE practice 4 of 7
Total questions: 24
Worksheet time: 12mins
The surface wettablilty of a contact lens is referred to as the:
wetting angle
hydrophobia
hydrophillia
moisture chamber
When fitting GP lenses intrapalbebrally, the fitter fits the lenses
large diameter and steep base curve
large diameter and flat base curve
small diameter and steep base curve
small diameter and flat base curve
The distance between a flat surface and the back surface of the central portion of a lens is referred to as
wetting angle
peripheral curve width
lens diameter
sagittal depth
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
Hyperflange
Myoflange
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
Hyperflange
Myoflange
Vertexting for contact lens begins at
+4.00 D
+7.00 D
+/-4.00 D
+/- 7.00 D
A change in the CPC by .05 mm will also change the anterior curve of the lacrimal lens by
0.25 D
0.50 D
0.75 D
1.00 D
When the CPC is fit flatter, the tear lens creates minus sphere power, therefore
SAM
FAP
When the CPC is fit steeper, the tear lens creates plus sphere power, therefore
SAM
FAP
A first generation gas permeable lens
PMMA
Glass
Haptic
If you increase the Optical Zone Diameter, you increase the sagittal depth, which _______ the fit.
flattens
steepens
has no change to
If you decrease the Optic Zone Diameter, you decrease the sagittal depth, which _______ the fit.
flattens
steepens
has no change to
If you increase the diameter of a GP lens, you ____________ the fit.
flatten
steepen
If you decrease the diameter of a GP lens, you ____________ the fit.
flatten
steepen
If peripheral curves are widened, the POZ will decrease which will _________ the fit.
tighten
loosen
Up to ________ diopter can be added to a GP lens modifying it in -house.
1.25
1.75
0.00
0.50
Tight or loose fits refer to the
Vault
Movement
Steep or flat refers to the lens
Vault
Movement
The first step in GP lens design is
Vertex
Transpose to minus cylinder
Apply SAM principle
Apply FAP principle
The CPC is also known as the
Power Curve
Fitting Curve
Which of the following is NOT a hard or GP lens material?
Fluorocarbon
CAB
HEMA
PMMA
Oxygen permeability is also known as
OP
L
DK/L
DK
Oxygen transmissibility is also known as
OT
L
DK/L
DK
Thickness is also known as
GPT
L
DK/L
DK
