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Magnifier Information What
you should consider in buying a Hand Held Reading Magnifier . A hand magnifier
is compact, portable and usually inexpensive but after a period of time your hand will tire. Those
with a hand tremor will find hand held reading magnifier hard to use - Select a reading
magnifier with a power that will allow you to perform your task at a comfortable distance.
- The higher the power of the reading 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.
- The hand held magnifier should be comfortable to hold.
- The lens should
be distortion free.
What you should consider in buying a Hands Free Reading Magnifier There are many types of hands free reading magnifiers
such as head magnifier, desk reading magnifier and magnifying lamps. Hands free magnifiers are
best for long term use and hand held magnifiers are used for the short term
- Allows for long duration use.
- Not portable.
- Usually more expensive then a hand magnifier.
- Larger
viewing area.
- Allows use of both hands for reading,
- Cord/Cordless or both.
- Lighted or unlighted magnifier.
Power Selection. - The higher the power of reading magnifier the shorter the focal range
and the smaller the field of view.
- Magnification powers can
range from 1.75X up to 8X.
- A reading magnifier with
very high power may not be your best choice.
- The high power magnifier may not be the best magnifier for you.
Diopter | Power | Focal
Range | | | 3 | 1.75x | 13" | | | 4 | 2.00x | 12" | | | 5 | 2.25x | 8" | | | 7 | 2.75x | 5.5" | | | 8 | 2.00x | 5" | | | 9 | 3.25x | 4.5" | | | 10 | 3.50x | 4" | | | 11 | 3.75x | 3.8" | | | 11.5 | 3.85x | 3.5" | | | 13 | 4.25x | 3" | | |
Eye-chart provided by Wikipedia Our large reading magnifier selection
can help those with presbyopia and macular degeneration. Field Of View: The size of the area being magnified when viewing
through a magnifier 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 magnifier 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. Magnifier 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 magnifier lens to the object being viewed. Fresnel Magnifier: A flat magnifier consisting of concentric circles that can be a full page
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.
Reading 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 Classroom National Eye Institute Optometry Cares American Action Fund for Blind Children & Adults Children's Eye Foundation Sight for Students MD Support National Eye Health Education Program, | 
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