Hand Held Magnifying Glass
With Light Information
Held Held Magnifying Glass With Light - Rules Of Magnification
hand held magnifying glass with a power that will allow you to perform your task at a comfortable distance.
higher the power of the hand held magnifying glass the shorter the focal range(work distance). To strong maybe to close.
For best hand held magnifying glass
with light results wear your glasses.
reduces light transmission. A hand held magnifying glass with light will provide a sharper and clearer image.
hand held magnifying glass with light models we have selected contain aspheric lenses; to prevent edge distortion
Why you may need
a hand held magnifying glass. As you enter middle age your near vision acuity changes and you
have trouble seeing small print This condition is called presbyopia. A
hand held magnifying glass is also helpful for vision impaired eye conditions
such as: macular degeneration, glaucoma cataracts.
type magnifier is best? A hand held magnifying glass is best
for short duration use and a hands free magnifying lamp or hands free magnifier with stand are
best for long duration use.
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 as "X"
Focal Length: Measurement from the center of the lens to to the object and be in focus
Focal Range: The distance
magnifying lens to the object being viewed.
Fresnel Magnifier: A flat magnifier consisting of concentric circles that can be a full page 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
The American Foundation for the Blind
The National Federation of the Blind
National Library Service for the Blind and Physically Handicapped
Paths To Literacy
National Eye Institute
American Action Fund for Blind Children & Adults