Domain III: Instrumentation for Measurement and Observation Flashcards

1
Q

Rigid contact lenses are verified before/after dispensing to the patient

A

before

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Verify CPC/base curve, power, diameter, optic zone, center thickness, peripheral curves, tint

A

For rigid lens contacts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Base curve ansi

A

0.1mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

diameter

A

0.1mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

POZ

A

0.1mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

pc’s

A

0.1mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

thickness

A

0.1mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

power

A

0.12D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

also know as the base curve, falls on the back of the lens/tear film of the eye
base curve=size of contact

A

central posterior curve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

radius of curvature measures the …, not the linear measurment

A

curve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

measures to 0.01 mm, drop of saline in the lens holder, lens floats concave side up
read clockwise

A

radiuscope

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

a) Determines size of both diameter and optical zone.
b) Used to examine surface of contact lens and edge of contact lens.

A

Shadowgraph

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

a) Used to determine diameter of lens and optical zone
b) Used to examine front surface of contact lens
c) Check Edge Contour

A

Hand held magnifier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Measured with handheld magnifier or shadowgraph

A

Optical zone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Curves flatten towards the periphery as the cornea flattens.
Specified to nearest 0.1 mm

A

peripheral curve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

posterior optical zone is always … than the diameter

17
Q

What checks blends

A

Profile analyzer

18
Q

RGP tint

A

usually Blue, Gray or Green

19
Q

on keratometer steeper curve = more

A

minification

20
Q

In keratometer steeper curve =

A

Higher diopter
lower base curve

21
Q

In keratometer flatter curve =

A

lower diopter
higher base curve

22
Q

in keratometer record … first

A

horizontal reading

23
Q

symmetrical astigmatism has … or … k readings

24
Q

between 30 and 60 or 120 & 150

A

oblique astigmatism

25
Can observe the entire extent of a corneal scar or infiltration
Diffuse illumination
26
The presence of folds in Descemet's membrane become visible
Diffuse illumination
27
The presence of any invading blood vessels in the cornea is disclosed.
Diffuse illumination
28
set-up (1) wide-open slit (flood light) (2) low magnification
Diffuse illumination
29
Overall view of anterior segment. Lens position and movement of contact lenses. Surface quality of lens.
Diffuse illumination
30
1-2mm slit, medium to high magnification, Cross-sectional view of cornea, Corneal clarity, Lens deposits
Parallelpiped
31
Useful in observing scars, infiltrates, staining, and the corneal-lens relationship
parallelpiped
32
1-2mm slit, Medium to high mag., Fine lens deposits, Subtle corneal imperfections, corneal endothelium
Specular reflection
33
direct illuminations ( microscope trained directly into the slit)
Parallelpiped Optic section specular reflection
34
Lets one identify the tear layer, epithelium, bowman's layer, stroma, endothelial zone
Optic section
35
helps to discover thickening, thinning, and distortions in the corneal contour.
Optic section
36
Determines the depth of foreign bodies or opacities in the cornea and capable of perceiving flare in the aqueous
Optic section
37
microscope trained adjacent to the slit
indirect, Retro illumination and sclerotic scatter