Physicists frequently:

• Sit for long periods of time.

It is important for physicists to be able to:

• See details of objects that are less than a few feet away.
• Understand the speech of another person.
• Speak clearly so listeners can understand.
• See details of objects that are more than a few feet away.

It is not as important, but still necessary, for physicists to be able to:

• See differences between colors, shades, and brightness.
• Determine the distance between objects.
• Use fingers to grasp, move, or assemble very small objects.
• Focus on one source of sound and ignore others.
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• Hear sounds and recognize the difference between them.