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Magnifier Information What you should consider
in buying a Hand Held Magnifier For Reading . 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 magnifier hard to use - Select a magnifying glass for reading books with a
power that will allow you to perform your task at a comfortable distance.
- The higher the power of the magnifier for reading 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 Magnifier For Reading There are many types of hands free magnifier for reading
small print such as head magnifier, desk 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 magnifier the shorter the focal range and the
smaller the field of view.
- Magnification powers can range
from 1.75X up to 8X.
- A 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 How
does a magnifier work? A magnifying glass is a lens through which can be used to make things appear bigger, so you can see them
better. It is used in many applications and manual operations, e.g., for examining postage stamps in philately. The magnifying glass consists of a piece of convex[ shaped glass or plastic. It has to be held at the right distance between the eye and the object for the object
to be in focus. Wikipedia 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 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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