SUZANNE GRALA / SCIENCE PHOTO LIBRARY SUZANNE GRALA / SCIENCE PHOTO LIBRARY
Elderly woman wearing varifocal lenses. Also called multifocal lenses or progressive lenses, these lenses vary in lens power from top to bottom, allowing variation from distance viewing to reading at close distances. They are normally prescribed in cases of presbyopia, age-related degeneration of the ability of the eyes to focus.
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