Glossary
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cleanable: to be free of dirt or debris
without being damaged by the cleaning process.
face shield: protective equipment generally used to
protect the wearer's face, or portions thereof, in addition to the eyes, from a variety of hazards. Face
shields are secondary protectors and must be worn only with primary protective devices.
filter lens: a lens that protects against various degrees of ultraviolet, visible,
and infrared rays.
front: the portion of a protective device frame that is intended to hold the lens
or lenses.
glare: uncomfortably bright light not including dangerous degrees of ultraviolet
or infrared light.
goggle: goggles fit the face directly surrounding the eyes in order to protect the
eyes from a variety of hazards. They can be used as a primary protector, or in combination with other eye and
face protection.
hand shield: a hand-held welding helmet.
headgear: the part of the protective equipment, such as a protective helmet, hood
or face shield that supports the device on the user's head.
hood: protective equipment that covers the head, neck, and portions of the
shoulders.
impact resistance: the capacity of a device to resist impact.
infrared radiation (IR): Invisible electromagnetic
radiation with wavelengths which lie within the range of 0.70 to 1000 µm.
laser: An acronym for light amplification by stimulated
emission of radiation. A laser is a cavity with mirrors at the ends, filled with material such as crystal,
glass, liquid, gas or dye. It produces an intense beam of light with the unique properties of coherency,
collimation, and monochromaticity.
lens, impact-resistant: a lens designed and tested to resist breakage when
impacted by an object.
lens, non-removable: a lens that is permanently attached to a frame.
lens, plano: a lens that does not include a corrective prescription, afocal.
lens, prescriptive: a lens made for an individuals specific vision correction.
lens, special purpose: a lens that is designed for visual tasks which require
unusual filtering of light.
lift-front: a lens that may be raised from its usual down position as needed.
light: The range of electromagnetic radiation
frequencies detected by the eye, or the wavelength range from about 400 to 760 nm. The term is sometimes used
loosely to include radiation beyond visible limits.
optical density: A logarithmic expression for the
attenuation produced by an attenuating medium, such as an eye protection filter.
optical radiation: Ultraviolet, visible, and infrared
radiation (0.35-1.4 µm) that falls in the region of transmittance of
the human eye.
photochromic lens: a lens designed to darken when exposed to sunlight and fade
when removed from the sunlight.
primary protector: personal protective device such as spectacles or goggles that
may be worn alone or in combination with a secondary protector.
radiant energy (Q): Energy in the form of
electromagnetic waves usually expressed in units of Joules (watt-seconds).
secondary protector: personal protective equipment that
can only be worn in combination with a primary protector.
side shield: a device attached to the front of the frame designed to provide
angular protection from impact hazards.
spectacles: protective devices intended to safeguard the wearer's eyes from a
variety of hazards. They are generally used to provide primary protection from impact and optical
radiation.
temple: the component of an eye and face protective device extending from the
frame to the ear, designed to fit the wearer and hold the device into place.
ultraviolet (UV) radiation: Electromagnetic radiation with wavelengths
between soft X-rays and visible violet light, often broken down into UV-A (315-400
nm), UV-B (280-315 nm), and UV-C (100-280 nm).
visible radiation (light): Electromagnetic radiation which can be detected
by the human eye. It is commonly used to describe wavelengths in the range between 400 nm and 700-780
nm.
wavelength: The length of the light wave, usually measured from crest to crest,
which determines its color. Common units of measurement are the micrometer (micron), the nanometer, and
(earlier) the Angstrom unit.
welding helmet: a shielding device using special absorptive lenses that filter the
intense light and radiant energy that is produced during welding operations.
window: a transparent protective device.
window, non-removable: a window that is permanently
attached to a frame or headgear.
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