Recent reports speak of a child born in Portland, Oregon, which had a median rudimentary eye between two normal eyes.

Fournier describes an infant born with perfectly formed eyes, but with adherent eyelids and closed ocular aperture.

Forlenze has seen the pupils adherent to the conjunctiva, and by dissection has given sight to the subject.
Dubois cites an instance of supernumerary eyelid.

At the external angle of the eyelid was a fold of conjunctiva which extended 0.5 cm.

in front of the conjunctiva, to which it did not adhere, therefore constituting a fourth eyelid.