The American National Standards Institute is a private, non-profit
organization that, among other duties, supervises the development of
industry standards for consumer goods.
An anti-reflective coating applied to the rear of
a lens to prevent glare from behind, e.g., when flying with the
sun at your back and low on the horizon.
The amount a sunglass curves around your face. A
regular sunglass is a "6"
base, a semi-wrap is an "8" base, and a full wrap-around is a "10" base.
An imaginary line drawn across the front of a lens
at the point where the temple attaches to the frame. The baseline is
the width of the lens in millimeters.
A straight earpiece that does not curve down behind
The distance, in millimeters, from the baseline on
the lens to the top of the reader lens.
An earpiece made of flexible cable that wraps around
the ear and holds eyewear on securely. Our "Gripper" has
a cable temple.
An optical quality acrylic plastic, it is the most
commonly used lens material in the eyewear industry. Most prescription
eyeglasses are made from acrylic.
The level of magnification, or "power",
in a reading lens, with lower numbers being weaker and higher numbers
stronger. We generally carry +1.25 (32), +1.5 (26), +1.75 (22), +2.0 (20), +2.5 (16), +3.0, and +3.5 magnifications (European numbers are in quotations). Stock may vary.
A scratch-resistant coat that is baked on the lens, it is more durable
than a regular air-dried coat.
A high definition lens that gives the best possible distinction between
objects in the distance. It is a "true color" lens (no color distortion).
An alloy of nickel and copper that is corrosion resistant, lightweight,
and durable, and is the most widely used metal in the eyeglass industry.
Lenses which have been polarized will block glare from a horizontal
surface. The resulting limited vision will make it difficult or impossible
to see your electronic equipment readouts, and will eliminate that glint
that you want to see from a cell tower or another aircraft in a see-and-avoid
situation. Polarization is not recommended for pilots.
Invented by General Electric, you know it by the name "Lexan". Highly
shatter-resistant, it is the strongest plastic in the world and is used
for everything from aircraft canopies to sunglasses. We recommended them for
open-cockpit flying, to help protect eyes from bird strikes.
A universal condition, it is the natural stiffening of the lens in
the eye that begins around 38-40 years of age. Correctable with a reading
lens, which will focus objects properly on your retina.
An air-dried coating applied to the front of a plastic lens to help
prevent scratches. See "Hard Coat".
The distance, in millimeters, from where the temple attaches to the
eye frame, to where it begins to curve over the ear.
Short-wavelength, high-frequency radiation, ultraviolet (UV) is divided
into three bandwidths: UVA (400-320 NM), UVB (320-290 NM), and UVC (290
NM and down). UVA and UVB can cause skin cancer, cataracts, and macular
degeneration. Fortunately, UVC, the most harmful, is absorbed by the
ozone layer before it reaches the surface of the earth.