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Many people need magnifying glasses in certain circumstances, for example reading a newspaper, a book, the fine print on a map, a menu as well as examining a diamond ring or gemstone. Currently, there are many kinds of magnifiers, including Head Visor magnifiers and pendant necklace magnifying glasses. The very first criterion is the type of magnifying one chooses should match the usage of it.

Magnifying glasses are actually provided in various styles and designs. And other people need specific magnifying power. As an example, ordinary people may use a 5x hand-held magnifier to look at windshield for defects. A pocket 10x folding magnification glass is helpful for any border protection department as well as a police department. In addition,
on glasses prescription may be used by a county department of agriculture to examine crops for insect and blight problems.

For general reading, hand held magnifiers are convenient and helpful. For newspapers or books, people always use a magnifier with 3x or 6x magnification about three or 4 inch diameter. And for finer print materials, magnifiers with 8x or 20x magnification are essential. For people with low vision, magnifying glasses in standard design are not competent and so they may make use of electronic vision aids which can offer greater magnification.

This is the explanation of several terms of magnifying glasses. Magnifying power means the ability of a magnification glass to increase the visual sized an object. A magnifying lens simply bends light inside a special way and bakes an image looks bigger than an actual object. The X indicates the magnifying power. For example, a 3x glass triples a picture and 4x magnifiers magnify a physical object 4 times.

Focal length or working distance is another way to classify magnifying glasses. This element represents the distance that should be set involving the magnifier plus an object to acquire the optimal magnification effect. As an example, a lens with 2x magnification and 5" focal length signifies that the lens provides double magnification when it is held far away of 5" from your object.

Field of view simply indicates the dimensions of the area that a person sees with the glasses. Depth of field may be the distance a magnifier may be moved above an object and still maintains focus ability. Generally speaking, depth field decreases as magnification power increases.