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We stock hands
free Fresnel magnifying glass with light, hand held Fresnel magnifier with light Fresnel magnifying sheet and Fresnel
magnifying lamps for reading.
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
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
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.
- High power magnifiers such as 8x must be held steady or
else they will be out of focus.
What Is A Fresnel Lens?
lens for reading purposes consists of a flat plastic lens with concentric grooves on one surface and a flat surface on the
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 This meant that more powerful and lighter lenses could be used in lighthouses.
Fresnel lenses are used as whole
page readers and are called magnifying sheets, magnifying glass sheets or sheet magnifiers.
For Fresnel Magnifier Users.
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
Children's Eye Foundation
Sight for Students
National Eye Health Education Program,