CES Office & Computer Ergonomics

Question 1

What is the recommended monitor height for a seated computer user to minimize neck strain?

Accepted Answer

Top of the screen at or slightly below eye level

Answer

Positioning the top of the monitor at or slightly below eye level allows the user to gaze slightly downward, maintaining natural cervical spine curvature and reducing neck extension.

Question 2

Which keyboard position is recommended to minimize wrist extension during typing?

Accepted Answer

Flat or slightly negative tilt (front edge higher than back)

Answer

A flat or slightly negative keyboard tilt encourages wrist neutral or slight flexion, avoiding the wrist extension that occurs with a positively tilted keyboard and increases carpal tunnel pressure.

Question 3

What is the correct elbow angle for a seated computer worker using a keyboard at the correct height?

Accepted Answer

Approximately 90-110 degrees (right angle or slightly open)

Answer

A 90-110 degree elbow angle allows the forearms to rest near horizontal with relaxed shoulder muscles, reducing upper extremity loading during keyboard use.

Question 4

Why is a document holder recommended for workers who reference paper documents while typing?

Accepted Answer

It positions documents near the monitor to reduce repetitive head turning and neck strain

Answer

Placing a document holder adjacent to the monitor at the same height and distance reduces the repetitive head rotation and neck flexion that occurs when looking between the desk and screen.

Question 5

What is the recommended viewing distance from the eyes to the monitor for most computer tasks?

Accepted Answer

18-30 inches (approximately arm's length)

Answer

A viewing distance of 18-30 inches reduces accommodative strain on the eyes and allows workers to read screen content without leaning forward or squinting.

CES - Certified Ergonomic Specialist Practice Test

CES - Certified Ergonomic Specialist Practice Test

CES Office & Computer Ergonomics