Minimizing Visual Fatigue
Prolonged exposure to computer screens may cause temporary visual fatigue. Factors contributing to this condition include the overall working environment, working habits and posture, screen flicker and blue light. Visual fatigue can be minimized by making certain adjustments to your work station or using computer screens with features that alleviate eye strain.
The surrounding work environment affects visual fatigue. Reducing glare and ensuring appropriate lighting can reduce the stress on your eyes.
Reduce glare by:
- Changing the position of any light source that is causing glare
- Fitting light sources with appropriate diffusers or lampshades
- Using curtains or blinds to minimize glare from direct sunlight
- Adjusting the position of your display to be perpendicular to the source of light or windows.
Ensure appropriate lighting:
Adequate lighting is necessary to avoid glare and eye fatigue, but excessive or insufficient lighting makes the screen more difficult to read. Generally, the lighting level should not exceed 750 lux, and levels ranging from 300 to 500 lux are most appropriate for computer desk work.
Recommended lighting arrangements include positioning work stations away from direct sunlight and using overhead lighting with baffles or louvers that reduce glare.
Prolonged exposure to computer screens may cause eye strain, which can include symptoms such as headache, burning eyes, blurred vision and discomfort. To minimize eye strain, you can adjust your working habits to let your eyes relax and recover.
Break Times - Take some time away from the screen, especially if you are working for long periods of time. Generally, taking short breaks (5–15 mins) after 1–2 hours of continuous computer work is recommended. Shorter, frequent breaks provide more benefit than long breaks.
Looking at Distant Objects - Users often blink less when using a display. To minimize eye strain and dryness, rest your eyes periodically by focusing on objects that are far away.
Eye and Neck Exercises – Specific exercises, such as those described below, can reduce eye strain and prevent the early onset of musculo-skeletal disorders. You should repeat these exercises often. However, if symptoms persist, it is recommended you consult a physician.
Exercises for the eye:
- Alternate looking up and looking down while keeping the body and head upright.
- Slowly roll your eyes to look to the left and right.
- Roll eyes to look at objects on the upper right corner and then on lower right. Do the same thing to look at objects on the upper left and lower left.
Exercises for the neck:
- Relax arm at the side. Bend head forward to slightly stretch the neck. Hold for five seconds.
- Relax arm at the side. Turn head to the right and hold for five seconds. Then turn head to the left and hold for five seconds.
- Relax arm at the side. Swing head to the left and hold for five seconds. Then swing head to the right and hold for five seconds.
An appropriate working position helps minimize eye discomfort. A comfortable seating position and ideal display placement are essential for a comfortable working experience.
- Seating Position
- Viewing Angle
Placing your display too far or too close may lead to eye strain. Too long a viewing distance causes users to lean forward to see small text, which strains the eyes and torso. Too short a viewing distance, on the other hand, strains the eyes by requiring more effort to focus and can force the user to sit with an awkward body posture (e.g., tilting the head, typing with outstretched arms).
The recommended viewing distance between the eye and the display screen is 1.5x the diagonal measure of the screen. Meeting this required distance in a cramped office situation can be a challenge—solutions include pulling your desk away from the wall or divider to make room for the display, using a flat panel or compact display and placing it in the desk corner, or placing the keyboard in an adjustable drawer to create a deeper working surface.
Lenovo's ThinkCentre AIO systems are designed to optimize work space.
Neck fatigue and pain may result from prolonged head turning to see objects on the screen. To minimize this, position the display directly in front of your head, neck and torso and face forward to the screen. The display should not be more than 35 degrees to the right or left of your head.
Also, do not have your display too high or too low as this contributes to awkward posture, which results in muscle fatigue.
Screen flicker refers to repeated changes in display light intensity. It is caused by several factors including, but not limited to, voltage fluctuations. Reducing flicker minimizes eye strain and headaches. ThinkCentre AIO allows users to use high-frequency display modes that can effectively reduce flicker.
Low Blue Light
Lenovo Vision Guard Control software (available on some ThinkCentre models) reduces the blue light emitted from the display, creating a less stimulating image and more relaxing vision experience for your eyes.
For more information about low blue light and instructions for downloading Lenovo Vision Guard Control software, please visit our Limiting Exposure to Blue Light page.