CES Office & Computer Ergonomics 2

Question 1

What does the 20-20-20 rule recommend for computer workers?

Accepted Answer

Every 20 minutes, look at something 20 feet away for 20 seconds to reduce eye strain

Answer

The 20-20-20 rule reduces computer vision syndrome by giving the eyes periodic rest from near-focus by looking at a distant object, relaxing the ciliary muscles.

Question 2

What is 'computer vision syndrome' and which ergonomic factors contribute to it?

Accepted Answer

Eye discomfort and visual fatigue from prolonged screen use, worsened by glare, poor lighting, and incorrect screen distance

Answer

Computer vision syndrome encompasses eye strain, dry eyes, headaches, and blurred vision from prolonged screen use, exacerbated by glare, improper viewing distance, and poor lighting.

Question 3

When should a sit-stand workstation be recommended as an ergonomic intervention?

Accepted Answer

When a worker must remain seated for extended periods without opportunity for postural variation

Answer

Sit-stand workstations are most beneficial when workers are required to sit for prolonged periods without opportunity for postural variation, reducing static loading on the spine.

Question 4

Which mouse design feature most effectively reduces ulnar deviation during cursor control?

Accepted Answer

A vertical or angled mouse that keeps the forearm in a handshake orientation

Answer

Vertical and angled mice position the forearm in a neutral pronation posture, eliminating the forearm pronation and ulnar deviation associated with standard flat mice.

Question 5

What seat pan depth is recommended to avoid pressure on the back of the knees in a properly adjusted office chair?

Accepted Answer

2-3 inches clearance between the front edge of the seat and the back of the knees

Answer

A 2-3 inch gap between the seat front edge and the popliteal area prevents pressure on the popliteal nerves and blood vessels while still providing adequate thigh support.

CES - Certified Ergonomic Specialist Practice Test

CES - Certified Ergonomic Specialist Practice Test

CES Office & Computer Ergonomics 2