Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

OT 726- Low vision > Performing Vision screenings > Flashcards

Performing Vision screenings Flashcards

1
Q

Snellen equivalent fraction

Fraction Represents the ____ (Numerator) over the ____ (denominator)

  • Numerator 20 Testing distance (20ft.)
  • Denominator 25 Corresponds to line on the test chart
A
  • Distance (numerator)
  • Letter Size (denominator)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

____ used primarily used in reading testing
* 1M equates to standard newspaper print

A

M Units

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

Units of meausre for acuity

What type of units of measure are seen here?
10 sans serif (block style) letters
* C D H K N O R S V Z
4 numbers
* 6 8 9 5

A

Sloan Units

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

standard acuity charts

Identify what type of chart this is:
* Designed to obtain the most accurate measure in normal to near acuity range
* Stops at** 20/200 (the big E)**
* Must measure at the distance specified by the chart (ALWAYS check before using a chart)

A

Snellen Chart

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

True/False: No measurement for Vision worse than 20/200

A

TRUE

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

Standard acuity charts

Identify what type of chart this is?

A

ETDRS chart (Sloan)

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

What type of screening is this characterized by the following:
* Visual Acuity
* High contrast (distance and near)
* Color vision
* Observation of performance

A

Basic Vision Screening

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

What type of screening is this characterized by the following:
* Visual Acuity
* High contrast (intermediate and near)
* Low contrast sensitivity (near)
* Observation of performance
* SRAFVP or functional assessment

A

Low Vision Screening

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

What are some methods physicians typically use to do a subjective measure using hand as the target & this is for people with acuity below?
1. Count fingers at X number of feet
(CF at X ft.)
2. If they cant see fingers, but can see hand waving;____
3. If they cant see hand movement, but can detect light from a penlight; Light perception only (LPO)
4. If the person cant see light;____

A
  • for acuity below 20/200
  • Hand movement (HM or HMO)
  • No light perception (NPO)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Low vision Acuity Test Charts provide more ____ ____ of acuity in the low vision range

A

Discrete assessment

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

How is the low vision acuity test accomplished?

A

By measuring acuity at Intermediate distance of 1 meter (instead of standard 10 or 20 ft.)

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

For the Low Vision acuity test charts; what is the extended measurable range?

A

20/1000 & less

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

What does the numerator in a Snellen fraction represent?
A) The distance between the patient and the chart
B) The size of the letters
C) The distance at which a normal eye can read the line
D) The degree of color blindness

A

A

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

Which visual acuity test uses block-style letters like C, D, H, and O?
A) Snellen Chart
B) ETDRS Chart
C) Farnsworth D15
D) Sloan Units

A

D

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

For low vision acuity, what intermediate distance is typically used?
A) 10 feet
B) 1 meter
C) 20 feet
D) 40 cm

A

B

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

Eye dominance is typically established during which stage of life?
A) Adulthood
B) Early childhood
C) Senior years
D) Adolescence

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Which test material is used to determine eye dominance?
A) Snellen Chart
B) Ishihara Plates
C) A card with a small hole
D) Warren Text Card

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What does OD stand for in vision shorthand?
A) Left eye
B) Right eye
C) Both eyes
D) No light perception

A

B

19
Q

Which color vision test is commonly used to distinguish between different types of color blindness?
A) ETDRS Chart
B) Ishihara Plates
C) Sloan Units
D) Mars Chart

A

B

20
Q

What does contrast sensitivity measure?
A) The ability to distinguish colors
B) The ability to see objects at far distances
C) The ability to see images as they degrade in contrast from their background
D) The ability to read small letters

A

C

21
Q

Which test is designed to measure low contrast acuity?
A) Lea Low Contrast Chart
B) Snellen Chart
C) Ishihara Plates
D) Sloan Units

A

A

22
Q

Which condition is most commonly associated with a loss of contrast sensitivity?
A) Glaucoma
B) Presbyopia
C) Cataracts
D) Age-related macular degeneration

A

D

23
Q

What percentage contrast on the Lea Low Contrast Chart indicates difficulty seeing facial expressions and subtle drop-offs?
A) 25%
B) 10%
C) 5%
D) 1.25%

A

C

24
Q

What does’ CC’ stand for in the physician’s shorthand for visual acuity?
A) Central Correction
B) Color Contrast
C) With correction
D) No correction needed

A

C

25
Q

What distance is typically used for a near visual acuity test?
A) 40 cm/ 16 inches
B) 1 meter
C) 20 feet
D) 5 cm / 2 inches

A

A

26
Q

Which tool is used to test for color vision deficiencies?
A) Snellen Chart
B) Sloan Chart
C) Farnsworth D15
D) ETDRS Chart

A

C

27
Q

Which type of color blindness is most common?
A) Blue-Yellow color blindness
B) Complete color blindness
C) Red-Green color blindness
D) Purple-Orange color blindness

A

C

28
Q

What is the main functional impact of reduced contrast sensitivity?
A) Inability to read small print
B) Difficulty detecting edges and low contrast objects
C) Loss of color discrimination
D) Difficulty seeing objects at a distance

A

B

29
Q

Which chart is commonly used for children and non-readers to assess visual acuity?
A) ETDRS Chart
B) HOTV Chart
C) Snellen Chart
D) MARS Chart

A

B

30
Q

What is the function of the ‘Warren Text Card’?
A) To test distance visual acuity
B) To assess color vision
C) To test near visual acuity for reading
D) To test for visual field defects

A

C

31
Q

What is the minimum contrast sensitivity percentage required for safe communication and mobility?
A) 1.25%
B) 5%
C) 25%
D) 10%

A

A

32
Q

What is one of the most common symptoms for patients with a reduced ability to detect low contrast?
A) Difficulty identifying bright colors
B) Difficulty identifying subtle water spills
C) Difficulty reading large print
D) Difficulty seeing objects in the dark

A

B

33
Q

For vision worse than 20/200, what method does a physician use to assess acuity?
A) Snellen Chart
B) Count fingers or hand movement
C) ETDRS Chart
D) Color vision test

A

B

34
Q

What does OU stand for in visual acuity shorthand?
A) Right eye
B) Left eye
C) Both eyes
D) No correction

A

C

35
Q

Which modification can be used for an eye dominance test if a card with a hole is unavailable?
A) Cardboard tube or rolled-up paper
B) Snellen Chart
C) Glasses with distance correction
D) Occluder

A

A

36
Q

Which is NOT a typical challenge faced by individuals with poor contrast sensitivity?
A) Detecting facial features
B) Reading bold print
C) Seeing spilled water
D) Driving performance

A

B

37
Q

The term ‘M units’ in visual acuity testing refers to what?
A) The distance used for near visual acuity testing
B) The thickness of lenses used in glasses
C) The lighting conditions during testing
D) The size of optotypes for reading tests

A

D

38
Q

What happens during the process of accommodation in the eye?
A) The lens thickens, pupils constrict, and eyes converge
B) The lens thins, pupils dilate, and eyes diverge
C) The cornea flattens and the eye adjusts to distance viewing
D) The retina adjusts to brightness

A

A

39
Q

In which environment is a vision screening typically performed?
A) Dark room with a single light source
B) Brightly lit room with light directed from behind the client
C) Dim room with a lamp shining into the client’s eyes
D) Outdoors in natural sunlight

A

B

40
Q

What is the main purpose of the Ishihara Color Test?
A) To detect color blindness
B) To test contrast sensitivity
C) To measure distance visual acuity
D) To assess reading ability

A

A

41
Q

What are some implications of color blindness that can impact on performance?

A

Detecting brake lights and traffic signals
Matching clothes
Distinguishing food items or medicines

42
Q

Screening Near or Reading Acuity

What three accommodations help prevent visual blur?

A
  1. Lens must thicken
  2. Pupils must constrict
  3. Eyes must converge
43
Q

Physicians may use shorthand when documenting acuity. Identify what these symbols mean:
OD: 20/200
OS: 20/100
OU: 20/200
CC
SC
V

A

V = visual acuity
OD = right eye
OS = left eye
OU = both eyes
CC= With
SC= Without

44
Q

Name at least two challenges detecting and identifying low contrast features

A
  • water spilled on a floor
  • gray cars moving against a gray background
  • facial features
  • glass filled with water
  • filling a glass with water

OT 726- Low vision (10 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions