Quiz For CVS Sources and Solutions

Use of a computer can

create a more demanding visual task setting

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create visual comfort

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necessitate glasses for everyone

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resolve all visual problems

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According to studies, what percentage of computer workers experience visual symptoms

30 %

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48 – 55 %

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50 – 90 %

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there is no specific statistic

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What is the correct term for the amount of light radiating in the direction of the viewer’s eye

illumination

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luminance

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brightness

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hue

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Improper lighting is likely a contributing factor to ________________

blindness

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visual discomfort

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presbyopia

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glaucoma

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What is not true regarding the geometry of lighting in the room

it is the least important aspect related to visual comfort

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it helps to determine the quality of lighting

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it relates to a good lighting situation

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it relates to field of view

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To prevent glare discomfort, what is a good maximum luminance ratio

1 to 25

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1 to 50

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1 to 3

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1 to 100

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The luminance level in foot candles (fc) for reference material is __________

80 – 120

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2500

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6000 – 12000

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200

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Bright open windows pose the same risk as _________________

an auxiliary lamp

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overhead light fixtures

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a light background display

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fluorescent lighting

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Directing light downwards will __________________

increase luminance

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decrease computer angle

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significantly reduce glare

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change the light intensity

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What can be retrofit with parabolic louvers

a desk

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a workstation

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a computer screen

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fluorescent light fixtures

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Which of these is not a good way to reduce reflection

use a white desktop

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wear a visor

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adjust the blinds on a window

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evaluate auxiliary lighting

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Which of these choices could cause glare discomfort

a visor

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a desk lamp

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a partition

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a matte gray desk blotter

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This type of reflection is mirror like ______________________

diffuse

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shaded

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specular

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blocked

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What is a volatile display

a display that suddenly powers down

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a display that only shows an image with battery or AC power

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a display that retains an image at all time

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the only display that has frosted glass

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What can be the result of specular reflection

an even glare

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a baffled image

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filtered light

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a hot spot

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A mesh filter will

increase reflections

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reverse all colors

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increase contrast

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block all pixels

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A neutral density filter commonly has how much transmittance

10 %

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30 %

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90 %

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20 %

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How does a privacy screen work

it reduces reflection by 30%

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it increases brightness

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it will limit the viewing angle of a monitor

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by the use of a hood

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What is an advantage of black characters on white

it is prone to reflections

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it is the same polarity as paper tasks

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the screen will not be a better match for the surrounding

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the screen will have evenly spaced hot spots

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When a user only needs to identify a single word periodically, then ___________

white on black may be advantageous

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the font size should be set to 56 pt

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it is best to use printed material

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the patient should relocate to a bright room

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What is not a true statement about a refresh rate

it was common with cathode ray tubes

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it caused a type of flicker

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it is related to CFF

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it only happened about once a minute

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What might give better character resolution with smoother borders

a high refresh rate

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a gray scale

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a dim screen

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less pixels

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16 inches or about 40 cm is what

how the eyes lead

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optical infinity

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the most common distance to view reading material

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the most common distance to view a computer screen

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At what downward angle attains the greatest visual comfort

5 to 10 degrees

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30 degrees

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10 to 20 degrees

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6 degrees of separation

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A wrist rest will __________________________

bend the wrist at a 90 degree angle

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keep the wrists straight

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cushion the palms too

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cause the shoulders to hold up the arms

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For ideal posture, the seat should be _____________________

higher than the bottom of the kneecap

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cushioned

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restrictive

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used for prolonged periods of time

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How has the work force shifted

to more physical labor

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to medical offices

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to office settings

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to computer use exclusively

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What is not true about a presbyope wearing a standard bifocal at a computer

the computer screen might not be seen clearly

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the patient might need to assume an awkward posture

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a presbyope will not wear a standard bifocal correction at the computer

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the flat top bifocal is fitted to enable near vision

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Younger presbyopic computer users ___________________

can be successfully fitted with single vision computer distance lenses

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must be fitted with a PAL

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should only use a bifocal

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will always have distance blur even with corrective lenses

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Which statement is true

specially designed PAL lenses cannot meet computer vision needs

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some progressive power technology designs have no distance power in the lens

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all PALs favor distance power

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all PALs favor intermediate power

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Which tint might be used to manipulate the spectrum to reduce indoor glare

yellow

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grey

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brown

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pink

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When do computer user need UV protection

only when the computer screen is close to the eye

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UV protection is not warranted for computer use

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when the patient has visual problems

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when the screen is white with black characters

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What is RPE

radiated pixel exam

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retinal pixilated external

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retinal pigment epithelium

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recorded pixel electronic size

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What is true about BluTech lenses

they filter out blue and blue-violet radiation

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they are available in sun lenses only

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they are only available in single vision lenses

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the filtering is applied to the lens after manufacture

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When is it important to determine if glasses are work-specific

if a patient wants one pair of glasses for everyday use

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when the patient changes jobs

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if the patient wants to see reimbursement from the employer

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if the patient wants to play video games

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Which of these is considered a gaming lens

a PAL with intermediate and near areas only

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a yellow PAL

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Gungam glasses

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Gunnar glasses

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When should treatment for dry eye be considered as computer related

any time the patient wants insurance reimbursement

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the symptoms are exacerbated by computer work

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when the patient complains about using eye drops too frequently

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when the patient blinks too frequently

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What is a normal tear break up time range

15 to 45 seconds

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10 to 15 seconds

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5 to 10 seconds

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50 to 60 seconds

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What is the best step when the computer screen is too high

sit on a pillow

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alter the desk arrangement

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take a 20/20/20 break

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change the airflow vents

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In the presence of ocular symptom _____________________

do not change the work arrangement

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ignore dry eye symptoms

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even slight tear deficiencies can be significant

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the use of hand held devices is prohibited

Correct Incorrect Correct answer

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