Traditional eyeglass lenses are designed to focus light and images on to the macula located in the back of the eye. Everyday glasses are used to correct the eye’s focusing problems: myopia (nearsightedness), hyperopia (farsightedness), astigmatism (unequal cornea curvatures) and presbyopia (decreased reading vision after age 40). These lens corrections put the image clearly onto the macula allowing for 20/20 vision when the macula and fovea are healthy.
When the macula is damaged the “picture remains faulty” even when the glasses are focusing the image properly on to the macula. The more the macula is damaged the poorer the vision.
Macular degeneration creates a blurry or blind spot in the center of vision. This interferes with reading and seeing fine details. Regular glasses are not able to restore this vision loss. If the film is damaged in a camera the vision will be blurred even when the camera is focused properly.
Low vision glasses are not your regular pair of eye glasses. They magnify the image beyond the damage areas in the macula.
Magnification is key for seeing better with macular degeneration. Thankfully, macular degeneration does not affect the side or peripheral vision.
Telescopic glasses are different from normal lenses due to their ability to magnify. They use several lenses in combination. Their design magnifies the incoming image to help people see better. By spreading the magnified image to undamaged parts of the macula and retina (peripheral vision) people see better. They help to see “around the blind spot”.
Telescopic glasses still need presciptions for myopia, hyperopia, astigmatism, and presbyopia to focus the magnified image onto the greater macular area.
The slimmed-down telescopes are mounted high in the eyeglass lens.
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