A diving mask (also dive mask or scuba mask) is an item of diving equipment that allows scuba divers, free-divers, and snorkelers to see clearly underwater. When the human eye is in direct contact with water as opposed to air, its normal environment, light entering the eye is refracted by a different angle and the eye is unable to focus the light. By providing an air space in front of the eyes, light enters normally and the eye is able to focus correctly.
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Famous quotes containing the words diving and/or mask:
“A worm is as good a traveler as a grasshopper or a cricket, and a much wiser settler. With all their activity these do not hop away from drought nor forward to summer. We do not avoid evil by fleeing before it, but by rising above or diving below its plane; as the worm escapes drought and frost by boring a few inches deeper.”
—Henry David Thoreau (1817–1862)
“‘Tis not need we know our every thought
Or see the work shop where each mask is wrought
Wherefrom we view the world of box and pit,
Careless of wear, just so the mask shall fit
And serve our jape’s turn for a night or two.”
—Ezra Pound (1885–1972)