Does not apply to Fresnel Lens magnifiers
which have a focal range of 4 inches
How does a magnifying glass work? A magnifying glass is a lens which can be used to make things appear bigger, so you can see them
better. It is used in many applications and manual operations.
Information On Fresnel Magnifying Glass On Stand.
A Fresnel standing magnifier consists
of a large Fresnel lens that allows for reading of a whole page.
What is a Fresnel magnifier?
A Fresnel magnifier consists of a flat plastic lens with concentric grooves that
permits 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 being viewed.
Fresnel Magnifier: A flat magnifier consisting of concentric circles that
can be a reading magnifier.
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.