MacAdam Eclipse

A visual representation of Color Contrast Thresholds. The smaller a MacAdam Ellipse, the better an individual’s Color Contrast Sensitivity.

Every chromaticity within a MacAdam Ellipse should appear identical. A colorblind individual has ellipses that stretch along their Confusion Lines.

When the size of the ellipses differs over the color space – as below – the color space is not a Uniform Color Space.