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Requirements from Regulations and Standards
193
ZG User’s Manual
5
APPENDICES
Definitions of Laser Classification
For Europe
Laser Product Classifications
EN
Note: Conditions for safe viewing of diffuse reflections for Class 3B visible lasers are: minimum viewing distance of
13 cm between screen and cornea and a maximum viewing time of 10 s. Other viewing conditions require a
comparison of the diffuse reflection exposure with the MPE.
For U. S. A
Comparison of Classifications between FDA and ANSI
Class Description
Class 1 Safe under reasonably foreseeable conditions
Class 1M As for Class 1 except may be hazardous if user employs optics
Class 2 Low power; eye protection normally afforded by aversion responses
Class 2M As for Class 2 except may be more hazardous if user employs optics
Class 3R Direct intrabeam viewing may be hazardous
Class 3B Direct intrabeam viewing normally hazardous
Class 4 High power; diffuse reflections may be hazardous
Class FDA definition ANSI description
Class I/1 Limits applicable to devices that have
emissions in the ultraviolet, visible, and
infrared spectra, and limits below which
biological hazards have not been
established. A Class 1 laser is considered to be
incapable of producing damaging radiation
levels during operation and maintenance
and is, therefore, exempt from any control
measures or other forms of surveillance.
Class IIa/2a Limits applicable to products whose visible
emission does not exceed Class I limits for
emission durations of 1,000 seconds or less
and are not intended for viewing. Class 2 lasers are divided into two
subclasses, 2 and 2a. A Class 2 laser emits
in the visible portion of the spectrum (0.4 to
0.7
μ
m) and eye protection is normally
afforded by the aversion response including
the blink reflex.
Class II/2 Limits applicable to products that have
emissions in the visible spectrum (400 to
710 nm) for emission durations in excess of
0.25 second, providing that emissions for
other durations and/or wavelengths do not
exceed the Class I limits. Class II products
are considered hazardous for direct long-
term ocular exposure.