Two distinct colors have been seen in an iris.

Berry gives a colored illustration of such a case.
The varieties of strabismus are so common that they will be passed without mention.

Kuhn presents an exhaustive analysis of 73 cases of congenital defects of the movements of the eyes, considered clinically and didactically.

Some or all of the muscles may be absent or two or more may be amalgamated, with anomalies of insertion, false, double, or degenerated, etc.
The influence of heredity in the causation of congenital defects of the eye is strikingly illustrated by De Beck.

In three generations twelve members of one family had either coloboma iridis or irideremia.