Traits

no visible depiction of an eye trait

light coloured sclera, darker coloured iris

dark coloured sclera, lighter coloured iris

very dark coloured sclera, lighter coloured iris

different coloured eyes (not actually a trait but to show the possibility)

any shape, any amount of pupils

any shape, different shape in each eye is possible

any colour possible

any combination of colours (even rainbow) pupils can be a solid colour or multiple colours as well

can be elemental (fire, ice, electric etc.)

any amount of eyes, can be placed on the body as well

any constellations or random star bits

glass sight filled with liquid (objects can swim inside) single or both eyes

either floral or crystal structures (for mineryes) single or both eyes

any object possible single or both eyes