Eye Colors of the Nigerian Dwarf
Unlike the case in humans, blue eyes in goats are dominant.
Because the blue eyes are dominant, a blue-eyed goat bred to a brown-eyed goat can produce blue-eyed kids.
Two brown-eyed goats bred together cannot produce blue-eyed kids.
A blue eyed goat can be homozygous for blue eyes, meaning it will only produce blue eyed offspring regardless of it's mate. Both of this goat's parents would have had to be blue eyed in order to have that chance of producing a homozygous blue eyed kid.
In very rare cases there have been several reports of a nigerian having one blue eye and one brown eye. It's extremely rare.
Blue eyes do not cause any health issues. No, your goat will not have trouble with blindness or hearing issues because of their blue eyes.
Bl Bl - Homozygous blue eyed. Will always produce blue eyed kids, regardless of mate.
Bl bl - Heterozygous blue eyed. Is blue eyed, but carries the brown eyed gene.
bl bl - Brown eyed. Does not carry the blue eyed gene and will never produce a blue eyed offspring unless bred to a blue eyed mate.
The chart below shows possible matings between blue eyed and brown eyed goats and the possiblities of their offspring's eye color(s).