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• Text should be easy to read. To help ease
eyestrain, adjust text attributes such as character
size, spacing, and color. In addition, you will need
to use the controls provided with your monitor to
adjust the visual settings so that contrast and
brightness levels are comfortable for you. High
contrast and low brightness is usually the
preferable combination.
Note:
The ISO 9241 and ANSI/HFS 100-1988 standards
give technical recommendations on how to achieve good
readability.
• The monitor should be free from flicker. If the
image on your screen is not stable, the monitor
may require repair or adjustment.
• When possible, use a program that has a simple
user interface, such as easily identifiable icons
and pull-down menus. Also, screen information
should be displayed in a structured and well-
organized way.
Monitor use specifications
• When viewing your monitor, your head should
not be tilted more than 15 degrees forward.
• Optimum readability for monitor use is generally
considered to be 21 minutes of arc. This
corresponds to a character size of 3.7 mm
(0.15 inches) at a viewing distance of 60 cm
(24 inches).
• You should not have to look up more than
5 degrees above horizontal or down more than
30 degrees below horizontal for normal work
tasks, such as typing or reading.
•
Chapter 1
Preparing to Use Your Computer
15
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