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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)
service and quality very seriously. answer for everything eyewear! Gradient Tint. Gradient tint is the term used to describe a lens with a fully tinted upper portion that gradually diminishes towards the bottom. Ultimately, the bottom section of a gradient lens will be completely clear.