(usually progressive lenses) An eyeglass lens having a smooth transition between parts with different focal lengths, correcting for vision at all distances.
- Trifocals can have visible lines or progressive lenses.
- Among those given progressive lenses, vision deteriorated at only half the rate of the other kids.
- Bifocals have been on their way out ever since the invention of progressive lenses, which gradually change the visual viewing area for distance and reading.
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