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Magnifier Information 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. Powerful magnifying glass, high powered magnifying glass and
strongest magnifying glass are the same type of magnifiers. Power/
work distance: Select a strong magnifying glass for reading with a power
that will allow you to perform your task at a comfortable distance (not to close). The higher
the power the shorter the focal range (work distance) and the smaller the field of view. To strong maybe to close.
Lighting: A high power magnifying glass with light, high power
lighted magnifying glass or a extra strong magnifying glass with light will provide better magnification
results as they provide a sharper and clearer image then a non-lighted strong magnifying glass. Magnification decreases
light transmission. Shop our large selection of strong magnifying
glass with light, large magnifying glass for visually impaired, powerful magnifying glass for visually impaired, strong
magnifying glass for reading and high power magnifying glass. Our high
power magnifying glass and powerful magnifying glass selection can help those with presbyopia and macular degeneration.
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
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 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.
Large selection of large high power magnifying glass for reading, strongest magnifying glass for reading, strong
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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 MD Support National Eye Health Education Program
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