Total absence of both irides has been seen in a man of eighteen.
Dixon reports a case of total aniridia with excellent sight in a woman of thirty-seven. In Guy's Hospital there was seen a case of complete congenital absence of the iris. Hentzschel speaks of a man with congenital absence of the iris who had five children, three of whom exhibited the same anomaly while the others were normal. Benson, Burnett, Demaux, Lawson, Morison, Reuling, Samelson, and others also report congenital deficiency of the irides in both eyes.
Jeaffreson describes a female of thirty, living in India, who was affected with complete ossification of the iris. It was immovable and quite beautiful when seen through the transparent cornea; the sight was only slightly impaired. No cause was traceable.
Multiple Pupils.--More than one pupil in the eye has often been noticed, and as many as six have been seen. They may be congenital or due to some pathologic disturbance after birth.
Marcellus Donatus speaks of two pupils in one eye. Beer, Fritsche, and Heuermann are among the older writers who have noticed supernumerary pupils. Higgens in 1885 described a boy whose right iris was perforated by four pupils,--one above, one to the inner side, one below, and a fourth to the outer side. The first three were slit-shaped; the fourth was the largest and had the appearance as of the separation of the iris from its insertion. There were two pupils in the left eye, both to the outer side of the iris, one being slit-like and the other resembling the fourth pupil in the right eye. All six pupils commenced at the periphery, extended inward, and were of different sizes. The fundus could be clearly seen through all of the pupils, and there was no posterior staphyloma nor any choroidal changes. There was a rather high degree of myopia. This peculiarity was evidently congenital, and no traces of a central pupil nor marks of a past iritis could be found. Clinical Sketches a contains quite an extensive article on and several illustrations of congenital anomalies of the iris.
Double crystalline lenses are sometimes seen. Fritsch and Valisneri have seen this anomaly and there are modern references to it. Wordsworth presented to the Medical Society of London six members of one family, all of whom had congenital displacement of the crystalline lens outward and upward. The family consisted of a woman of fifty, two sons, thirty-five and thirty-seven, and three grandchildren--a girl of ten and boys of five and seven.
The irides were tremulous.
Clark reports a case of congenital dislocation of both crystalline lenses. The lenses moved freely through the pupil into the anterior chambers. The condition remained unchanged for four years, when glaucoma supervened.
Differences in Color of the Two Eyes.--It is not uncommon to see people with different colored eyes. Anastasius I had one black eye and the other blue, from whence he derived his name "Dicore,"by which this Emperor of the Orient was generally known. 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. He performed two operations for the cure of cataract in two brothers. The operations were attended with difficulty in all four eyes and followed by cyclitis. The result was good in one eye of each patient, the eye most recently blind.
Posey had a case of coloboma in the macular region in a patient who had a supernumerary tooth. He believes the defects were inherited, as the patient's mother also had a supernumerary tooth.
Nunnely reports cases of congenital malformation in three children of one family. The globes of two of them (a boy and a girl) were smaller than natural, and in the boy in addition were flattened by the action of the recti muscles and were soft; the sclera were very vascular and the cornea, conical, the irides dull, thin, and tremulous; the pupils were not in the axis of vision, but were to the nasal side. The elder sister had the same congenital condition, but to a lesser degree. The other boy in the family had a total absence of irides, but he could see fairly well with the left eye.
Anomalies of the Ears.--Bilateral absence of the external ears is quite rare, although there is a species of sheep, native of China, called the "Yungti," in which this anomaly is constant.