Magnifier Information
What type magnifier is best? Hand
held magnifiers are best for short duration use and a magnifying lamp or hands free magnifier with stand are
best for long duration use.
Magnifier glass power and work distance: Select magnifiers with a
power that will allow you to perform your task at a comfortable distance. The higher the power of the magnifier the
shorter the focal range(work distance) and the smaller the field of view.
The
high power magnifier may not be the best magnifier for you. Our large magnifier selection can help
those with presbyopia =and macular degeneration.
.
Field Of View: The size of the area being magnified when viewing through a magnifying
lens. The higher the power of the magnifier the smaller the field of view.
Diopter: Diopter is a measurement that is used to calculate the power
of a magnifying lens. The higher diopter will provide higher magnification. Diopter is expressed as "D"
Power: Power is how large an object or print increases as you look through
a lens. Magnifying power is expressed as "X"
Focal Length:
Measurement from the center of the lens
to to the object and be in focus
.
Focal Range:
The distance from the magnifying lens to the object being viewed.
Fresnel Magnifier: A flat magnifier consisting of concentric
circles that can be a full page reading magnifier.
Visual impairment (or vision impairment) is a decreased ability to see to a degree that causes problems not fixable by usual means, such
as glasses or medication. Our low vision magnifiers can be of help.
Rules
Of Magnification.
- The
higher the power of the lens, the closer you must get to the object being viewed and the smaller the field of
view.
- As the power
of a lens increases the diameter of the lens decreases.
- Diopter is a term used to determine the power(magnification}of a lens. The
terms are sometimes confused.
Informative links for wearable
magnifying glasses.
Informative Links
Visually
Impaired Links
The American Foundation for the Blind
The National Federation of the Blind
Bookshare
National Library Service for the Blind and Physically Handicapped
Paths To Literacy
Jewelers Trade Links
Accredited Gemologists Association
Industrial Diamond Association of America, Inc.
International Watch & Jewelry Guild
Jewelers of America
Jewelry Industry Distributors Association
Silver Institute
Women’s Jewelry Association
American Watchmakers-Clockmakers Institute
