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Additional
diving mask
English Wikipedia - The Free Encyclopedia
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Diving mask
A
diving mask
(also
half mask
,
dive mask
or
scuba mask
) is an item of
diving equipment
that allows
underwater divers
, including,
scuba divers
,
free-divers
, and
snorkelers
to see clearly
underwater
.
Surface supplied divers
usually use a
full face mask
or
diving helmet
, but in some systems the half mask may be used. 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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