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A gradient lens is tinted darker at the top and fades to clear at the bottom. It helps block out bright light from above while keeping the bottom clear for things like reading or using your phone. If you're looking for these lenses, Eyeglass Direct has a nice range of stylish options that are both practical and fashionable.
Numerator on top; denominator on the bottom.
the top adds what the bottom adds. the top subtracts what the bottom subtracts. the top divides what the bottom divides. the top multiplies what the bottom multiplies.
bottom
Top: numerator. Bottom: denominator.