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After the age of about
forty you will experience a problem viewing small print and tasks involving close detail work. This eye condition is called
presbyopia and magnification is the answer.
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 an around the neck magnifier with a power that will allow you to perform
your task at a comfortable distance.
The higher the power of the neck 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
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.
higher the power of the lens, the closer you must get to the object being viewed and the smaller the field of
- As the power of a lens increases the diameter of the lens decreases.
- Diopter is a term used to determine
the power(magnification0of a lens. The terms are sometimes confused.
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The American Foundation for the Blind
The National Federation of the Blind
National Library Service for the Blind and Physically Handicapped
Paths To Literacy
National Eye Institute
American Action Fund for Blind Children & Adults
National Eye Health Education Program