Computer Vision

computer vision syndrome (digital eye strain)

describes a group of eye & vision related problems that result from prolonged computer, tablet, e-reader & cell phone use

64-90

____% of computer users experience visual sx after prolonged computer use

22

___% of computer users have musculoskeletal disorders

1. eyestrain

2. blurry near or distance vision

3. HA

4. dry/irritated eyes

5. neck, shoulder, back pain

6. photophobia

7. diplopia

what are some common sx associated w/ computer use?

1. refractive

2. ocular

3. light sensitivity or glare

4. musculoskeletal

what are the 4 categories of sx associated w/ computer use?

1. refractive error

2. accommodative disorder

3. BV issues

refractive sx can be caused by:

eyestrain, HA, general eye discomfort

generally, refractive sx associated with computer use manfiest as what?

1. BV testing

2. accommodative testing

refractive sx associated w/ computer use may be addressed through:

1. consider correcting presbyopia earlier for computer users

2. use an appropriate lens style

3. prescribe w/ computer screen distance in mind

how should you solve presbyopia problems associated w/ computer use?

1. SV lenses prescribed for screen distance

2. use intermediate/near BF design instead of traditional

3. use occupational segmented lenses

4. employ a specialty PAL (best solution)

what are the possible lens corrections for presbyopic computer users?

1. dry/irritated eyes

2. CL discomfort

3. red/teary eyes

what are the ocular sx of computer use?

1. decreased blink rate

2. looking straight ahead

3. incomplete blink

4. dry office environment

what are some potential causes of dry eye associated w/ computer use?

1. rest eyes intermittently & blink forcefully/fully (20-20-20)

2. ATs

3. ensure correct placement of monitor

4. humidifier

what are the possible solutions for computer-associated dry eyes?

poor workplace lighting

what is a potential cause of computer vision problems caused by light sensitivity?

equal

lighting is most comfortable when the brightness of the computer screen & the FOV are relatively _____

1. turn off offending light

2. rotate workstation

3. draw curtains or blinds

4. re-design lights

5. avoid bright reflective surfaces

6. use desk lamps correctly

7. adjust screen brightness

what are some ways to eliminate bright light problems?

1. eliminate light source

2. use anti-reflective screen

3. use a screen hood

how do you get rid of light reflections?

Gunner technology eyeware

• available as non-prescription & prescription eyewear; for use in normal computer use but especially for serious video game enthusiasts

• 1.51 index lens

• low density

• higher Abbe value

• good impact resistance (apparently)

• primarily for younger wearer

• Amber lens tint (cuts short wavelength light & enhances perceived contrast)

  • also available in crystalline for people whose profession requires that they work with true color

• AR & anti-scratch coatings

• highly wrapped lens (traps humidity to lessen dry eye sx)

• straight-back temple to be compatible with earphones

1. neck ache

2. back ache

3. shoulder pain

musculoskeletal computer-related sx:

1. poor ergonomics

2. improper visual correction

3. incorrect spec design

what are some potential causes of musculoskeletal computer-related symptoms?

4-8, 10-20

the best drop to screen center is one that allows the person to read w/o bending the head or neck down or back, which is normally _____in, ____degrees

1. upright sitting posture

2. standing posture

3. declined sitting posture

4. reclined sitting posture

what are 4 OSHA-recommended working positions?