A spot of a different colour, included in a plaga or macula.
In order then to avoid diplopia the macula lutea moves to where the retinal image is formed.
A roundish dot intermediate in size between an atom and a macula.
Gibbous: hump-backed; protuberant: said of a macula when it resembles a moon more than half full.
Macula: a colored mark larger than a spot; of indeterminate ...