Magnifying Glass For Reading Information As we age our visual acuity decreases and reading and many other tasks become more difficult
and causes strain. This condition is called presbyopia and a reading magnifying glass will make reading
easier and more enjoyable. Magnifier glass power and work distance: Diopter | Power | Focal Range | | | 3 | 1.75x | 13" | | | 4 | 2.00x | 12" | | | 5 | 2.25x | 8" | | | 7 | 2.75x | 5.5" | | | 8 | 2.00x | 5" | | | 9 | 3.25x | 4.5" | | | 10 | 3.50x | 4" | | | 11 | 3.75x | 3.8" | | | 11.5 | 3.85x | 3.5" | | | 13 | 4.25x | 3" | | |
 Eye-chart provided by Wikipedia How does a magnifying glass work? A magnifying glass is a lens through which can be used to make things appear bigger,
so you can see them better. It is used in many applications and manual operations, e.g., for examining postage stamps in philately. The magnifying glass consists
of a piece of convex shaped glass or plastic. It has to be held at the right distance between the eye and the object for the
object to be in focus. The magnifying glass usually comes with a handle. A telescope is a more advanced kind of magnifying glass and consists
of at least two glass lenses. Spectacles or eyeglasses also use lenses to correct a person's vision. Source: https://simple.wikipedia.org/wiki/Magnifying_glass     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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