The STRONGEST magnifying glasses for the visually impaired are digital magnifiers (also known as electronic magnifiers, video magnifiers and low vision cctvs). These are much stronger than the best quality magnifying glasses with light, and can have up to 70x magnification.
Higher magnifications of 10x and upwards may be invaluable for acute low vision or for microscopic detail but most users will probably find magnification strengths between 2x and 7x to be adequate. Some people like to have more than one to cover different magnification tasks.
A perfect magnifier would be lightweight, have a large diameter, provide a wide viewing area, and offer high, distortion-free magnification. However, incorporating all of these features into one unit is optically impossible. The magnifying power of a lens depends on its focal length (fl).
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The view through the magnifying lens should be crystal clear with no internal reflections. Highlights should be sharp and brilliant, with no colored fringes. The lens should be achromatic. A flat object should not look buckled or warped.
A hand-lens, for example, might be labeled with 10x , meaning the lens magnifies the object to look ten times larger than the actual size. Compound microscopes use two or more lenses to magnify the specimen. The standard school microscope combines two lenses, the ocular and one objective lens, to magnify the object.
At 3x magnification , you likely would still see the entire head and shoulders of the president on the 1-dollar bill. As you climb in magnification power, you will lose viewing area but get more pinpointed detail at a closer range.
A magnification of “100x” means that the image is 100 times bigger than the actual object. = ocular x objective For example, if the ocular is 10x and the low power objective is 20x , then the total magnification under low power is 10 x 20 = 200x.
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When over-the-counter readers are good enough Off-the-rack readers are essentially two magnifying lenses mounted in an eyeglass frame. Just like prescription lenses, they afford varying degrees of magnification, or refraction, usually ranging from +1.00 to +3.50 diopters.
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A magnifying glass (called a hand lens in laboratory contexts) is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle.