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The gradient is a fancy word for derivative, or the rate of change of a function. Itâs a vector (a direction to move) that. 1  Points in the direction of greatest increase of a function (intuition on why)  Is zero at a local maximum or local minimum (because there is no single direction of increase)
Things we like. Gradient lenses are sunglasses that have lenses tinted from the top down, so that the top of the lens is darkest. They are not a style exactly, so much as a look that has become increasingly popular for both men and women in the past few years. There are a variety of different reasons why tinted lenses are practical: