Canthal tilt
The angle of the line from the inner to the outer corner of the eye: upturned, level or downturned.
Also: eye tilt, upturned eyes, downturned eyes
Canthal tilt describes whether the outer corner of the eye sits higher than the inner corner (positive tilt, upturned eyes), level with it, or lower (negative tilt, downturned eyes). Most people's tilt is slightly positive, and it often changes a little with age. Online claims that one tilt is more attractive are not science. Makeup artists use winged liner to lift or extend the outer corner if wanted, or simply follow the natural line.