What is full page
A full page magnifying glass, magnifying
page reader, full page magnifier or a whole page magnifying glass for reading consists of a Fresnel lens that enables large area magnification.
A Fresnel Lens?
A Fresnel lens for reading
purposes consists of a flat plastic lens with concentric grooves on one surface and a flat surface on the other surface
and is often called a reading page magnifier.
Originally invented by Augustine
Fresnel. The original Fresnel lenses were used to magnify the lighthouse beacon light. A Fresnel lens is thinner
and lighted then a ordinary convex magnifying lens.Wikipedia
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 a full page magnifier can help.
Magnifier glass power and work distance: Select a
full page magnifier with a power that will allow you to perform your task at a comfortable distance. The
higher the power of the full page magnifier the shorter the focal range(work distance) and the smaller the field of
page magnifier will
magnify a whole page. Make reading more enjoyable with our optical quality Fresnel full page magnifier and
reading page magnifier and eliminate eye strain. For best full page magnifier results wear
your reading glasses.
The high power magnifier may not be the best magnifier for you. Our large full page 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 full page 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.
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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