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Visionix VX40 - Glossary of Terms

Visionix VX40
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Appendices
VX40 User Guide
52 / 53
Waste Electrical and Electronic Equipment (WEEE) Directive
Luneau SAS is registered as manufacturer by the French Agency, ADEME, for the
2002/96/CE, 2002/96/CE and 2003/108/CE directives.
This symbol is located on the VX40 and indicates that the equipment consists of
electronic assemblies and other components that may be subject to Directives
2002/96/EC, 2003/108/EC and 2002/95/EC of the European parliament, which
advises that electrical and electronic devices must not be disposed of as normal
domestic refuse. In order to prevent environmental risks or endangerments by non-
professional disposal, the disposal of this product, including any accessories, must
comply with valid practices as outlined in Directives 2002/96/EC, 2003/108/EC and
2002/95/EC and local regulations. All electronic components and systems should be
returned to Original Manufacturer for disposal.
9.3 Glossary of Terms
Term
Explanation
Pupillary Distance
Pupillary Distance (P.D.) or interpupillary distance (I.P.D.) is
the distance (the industry standard is to measure in
millimeters) between the centers of the pupils in each eye.
This measurement is used when preparing to make
prescription eyeglasses. Positioning lenses correctly in
relation to the center of the pupils is especially important for
higher powered lenses due to the location of the optical
center of the lenses. It can also be relevant to binoculars:
they must be adjusted to suit the user's I.P.D.; and the
minimum allowed by some binoculars is still too great for
people with a small I.P.D.
Spherical Aberration
An aberration that can occur in optical systems when rays
are traced after reflection.
Cylindrical Lens
A lens with one face a portion of the curved surface of a
cylinder
Reflection
The process occurring when light strikes the surface of
separation of two different media such that some is thrown
back into the original media.

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