The eye is one of the most delicate as well as the most complicated organs of the body, and its diseases are but very imperfectly understood by the ordinary practitioner. A great deal of mischief has been done by improper treatment of diseases of the eye, and I may also include the ear, and many persons who now mourn the loss of sight and hearing, partially or wholly so, might yet be in enjoyment of those senses if they but had received the proper treatment. Under this head I shall include those diseases only which are capable of treatment in domestic practice.