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Magnifier Information What Is 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 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.
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help in reading but an ordinary magnifier only enlarges a small section of the page. - A full
page magnifier will magnify a whole page.
- Make reading more enjoyable with our optical quality Fresnel page
magnifiers eliminate eye strain.
- For best full page magnifier results wear your reading glasses.
What is full page magnifier? A full page reading magnifier consists of a Fresnel lens that enables large area magnification. Available as a hand held
full page magnifying glass or a hands free full page magnifier. What type of full page magnifier for reading should I use? A hand held full page reading magnifier for should be
used for short term use. A hands free full page magnifying glas should
be selected for long duration use. How does a full page
magnifying glass work? Full
page magnifiers have a focal range of up to 4 inches and do not lay flat on the page. Dome magnifiers
lay flat on page. Advantage of a full page magnifier with light: A lighted full page reading magnifying glass are best as they provide a sharper and clearer image.
Our full page magnifier with light for reading are led lighted and provide a soft white light. Lighted page magnifiers are available as hand held magnifier and
hands free magnifier models.
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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. Large selection
of full page magnifier with light. What type magnifier is best? A
hand held full page magnifying glass is best for short duration use and a hands free magnifying page
for reading, magnifying page reader or hands free full page magnifier are best for long duration
use. Magnifier glass power and work
distance: Select a book size magnifier with a
power that will allow you to perform your task at a comfortable distance. The higher the power of the
full page magnifying glass the shorter the focal range(work distance) and the smaller the field of view. The high power magnifier magnifying page 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 "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. 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.
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