Lighted magnifiers come in a wide variety of styles and shapes. The most important consideration when purchasing a lighted magnifier is the type of lighting. Lighted magnifiers come in LED and incandescent styles. Generally speaking a lighted magnifier with an incandescent bulb will be less expensive than an LED lighted magnifier. However, LED magnifiers are generally brighter and use far less power than an incandescent bulb. When you consider the cost of batteries, LED magnifiers are typically a cost-effective investment.
Not necessarily, the higher the magnification the shorter the focal distance. So in order to use a high-powered magnifier, you would need to put your head very close to the object you are viewing. In addition, a magnifier that is too powerful will distort the image making it difficult to read. Lastly, a high-powered magnifier has a very small viewing area. If you have too high a magnification, it becomes difficult to use the Magnifier as you end up focusing on too small a part in the page. Don’t get too caught up with magnification. Regretfully we are in an industry where some companies exaggerate magnification. Buyer beware!
Glass magnifiers allow very high light transmission, which provides a very clear, precise image. Glass magnifiers are also durable and extremely difficult to scratch. There are many grades of glass available, however the best grade of glass magnifying lenses is better than the best grade of acrylic lenses. Glass magnifiers typically magnify slightly more than acrylic magnifiers as a result of the material density.
A bifocal lens is a lens that has two different powers within it. An example of this is demonstrated in the Ultra 3x-6x hand magnifier. The large portion of the lens has a magnification of 3x, and the smaller lens, which is molded as an integral part of the larger lens, has a magnification of 6x. In spectacle lenses, the upper portion of the lens has a proper prescription for distance viewing and the lower portion has the proper RX for close up viewing.
The field of view is the size of the magnified area under the lens that is in focus. The field of view decreases as power increases. More powerful lenses make small details look big, but less of the total object is visible. There is a trade-off for the viewer who must decide between the size of the field of view and amount of magnification. Low vision.
Diopter refers to the curvature of a lens. As the diopter increases, the lens becomes thicker and the curvature greater. As the curvature increases, light rays are redirected to fill a greater portion of the viewer's retina, which makes the object look bigger.
Proper lighting is equally important as magnification in achieving a good viewing situation. A magnifying lens would be useless in the dark, so increasing light levels result in better vision. In fact, the better the quality of light used with a magnifying lens, the less power is needed. When less magnification is required, the user has a bigger field of view and working distance under the lens. Therefore, the quality of light should be closely evaluated when choosing an illuminated magnifying lamp. Low vision.
As the lens size of the magnifier lens decreases, the magnification power of the magnifier increases. This is a result of the amount of curvature in the magnifier (lens). Magnification power is a result of the amount of curvature in the magnifier lens.
Low vision means that even with regular glasses, contact lenses, medicine, or surgery, people find everyday tasks difficult to do. Reading the mail, shopping, cooking, seeing the TV, and writing can seem challenging.
Millions of Americans lose some of their vision every year. Irreversible vision loss is most common among people over age 65.
Recognizing faces of friends and relatives?
Doing things that require you to see well up close, like reading, cooking, sewing, or fixing things around the house?
Picking out and matching the color of your clothes?
Doing things at work or home because lights seem dimmer than they used to?
Reading street and bus signs or the names of stores?