the blinking disaster. A laser with the hazard of other wavelength to the naked eyes is
not more than Class 1. It may be dangerous to make the direct internal view observation
of light beam of Class 3A by optical devices (e.g., binocular eyepiece, telescope
microscope).
The direct internal view observation of light beam is dangerous, while observing the
diffuse reflection is safe. The safety conditions for observing the diffuse reflection of
such visible laser are: the longest observation time is 10s for the laser when the shortest
distance from the optical screen to the cornea is 13cm.
The diffuse reflections which can produce danger may cause skin burns and fires. Such
laser products should be used with special care. The laser should be handled with
special care if it is emitted when the machine housing is removed, and the safety door
or the laser silo door is opened.
2.8.2 Irradiation time and damage mechanism
Ultraviolet
radiation C
(180nm-
280nm)
Erythema (sun burn),
acceleration of the skin
aging process
Ultraviolet
radiation B
(280nm-
315nm)
Hyperpigmentation
Dark color and light
sensitization
Skin burns
Ultraviolet
radiation A
(315nm-
400nm)
Dark color and light
sensitization
Skin burns
Visible light
(400nm-
780nm)
Retinal damage caused
by photochemical and
thermal effects.
Dark color and light
sensitization
Skin burns
It is forbidden to look directly at
the light source of the indicating
red light of this machine which
belongs to this kind of light.
Infrared
radiation A
(780nm-
1400nm)
It is forbidden to look directly at
the light source because the laser
wave of this machine belongs to
this Class.
Infrared
radiation B
(1.4μm-
3.0μm)
Cataract, water
evaporation
Corneal burns
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