| Magnifier Information What type magnifier is best? Hand held sewing magnifiers are best for
short duration use and magnifying sewing lamps, sewing glasses, magnifying lamps for sewing and free standing
sewing magnifying lamps are best for long duration use. Magnifier glass power and work distance: Select magnifying glass for sewing or magnifying sewing lamp with a
power that will allow you to perform your task at a comfortable distance. The
higher the power of the sewing glasses the shorter the focal range(work distance) and the smaller the field of
view. The high power magnifier magnifying sewing lamps 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 sewing magnifying glass 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.
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