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Progressive glasses, also called seamless trifocals, these hi-tech progressive eyeglasses have blended three focal distance areas into each lens, such that the upper part of the lens is focused for distance vision, the center portion for middle distance (e.g., reading labels on supermarket shelves), and the lower portion is focused for reading and the computer screen.
The progressive glasses with their theory of near, middle and far sightedness, work well for all age groups alike, including older, adult, and child. Progressive lenses are made in such a way that the focal length of the eyes change according to the object. Progressive glasses are as good as healthy vision. You can also make them photo chromatic if you wish.
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