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As we age our visual acuity decreases and reading and many other tasks become more difficult.
condition is called presbyopia and a magnifier makes reading, crafts and close detail tasks more enjoyable.
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.
Power and diopter:
There is confusion over the terms lens power(x) and lens diopter(D).
Diopter is a term that is used to calculate power. Ex: 4 diopters(4D) =
Does not apply to Fresnel Lens magnifiers
which have a focal range of 4 inches.
Information On Fresnel Hands Free Magnifiers:
A full page hands free magnifier consists of a Fresnel lens that allows reading of a
whole page. The advantage of a full
page hands free magnifier is that it is whole page magnifier.
What Is A Fresnel Magnifier?
A Fresnel magnifier consists of a
flat plastic lens with concentric grooves for magnified viewing. The focal length
is about 4 inches from the object to be viewed.
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.-