Cross Stitch Magnifier Glass Information
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. 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
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.
High power magnifiers, such as 8x must be held steady, or else they will be out of focus.