Computer Environment

Question 1

complaints of digital device users

Answer 1

eye, vision, behavioral, physical complaints

Question 2

asthenopia symptoms of digital device users

Answer 2

-eyestrain (tense)
-eye fatigue (heavy)
-sore eyes
-headaches
-dizziness
-nausea

Question 3

Visual symptoms of VDT users

Answer 3

blurred vision, DV, focus adjustment, presbyopia, oblique fixation, color perception disturbance

Question 4

Ocular symptoms of VDT users

Answer 4

dry, watery, red, irritated eyes, CL discomfort

Question 5

musculoskeletal symptoms of VDT users

Answer 5

neck, back, shoulder ache
light sensitivity - glare & flicker

Question 6

behavioral and physical complaints

Answer 6

*feeling of isolation
* posture change
* nervousness about “dangers” of digital devices
* nervousness due to performance
*interpersonal problems
*increased colds/flu’s, decreased resistance
* allergy development

Question 7

visual contributors to CVS

Answer 7

*dry eyes
*reduced blink rate
* average blink rate, 20/minute
* at VDT, 5-7/minute
*tear insufficiency
* ocular allergies
* contact lens wear
*spectacle lens design

Question 8

cumulative trauma disorders

Answer 8

aggravated by the cumulative application of biomechanical stressors to tissue and joints,

Question 9

lighting ergonomics

Answer 9

*filter over fluorescent tubes decrease illumination levels
-reduce for glare discomfort

Question 10

monitor ergonomics

Answer 10

below eye level tilted 10-20 degrees away
40-70cm away right angle to window

Question 11

Effect of Monitor Output

Answer 11

*accommodative system response
*affected by an individual’s accommodative lag
*RPA (resting point of accommodation)

Question 12

DYNAMIC POWER

Answer 12

*Power differential between bottom of lens and top of lens