400 



DISEASES OF THE EYES 



tears from the internal angle of the eyes, irritation of the skin, and loss 

 of hair below the opening. 



Hypertrophy of the lachrymal canal is duo to various inflammatory 

 processes or neoformations. 



The treatment of closure of the lachrymal canal is a very difficult and 



Fig. 13S — Protrusion of the membrana nictitans. 



delicate operation to handle. It consists in trying to establish a new 

 opening into the nasal cavity and direct the tears into it. 



Diseases of the Membrana Nictitans. — Irritation of this organ may 

 result from various pathological processes which affect the conjunctiva, the 

 membrana nictitans being covered on both surfaces by that membrane. 



Fig, 139. — Removal of the membrana nictitans. 



Follicular conjunctivitis frcqviently causes the formation of various sized 

 nodules (hypertrophied follicles) round bodies about the size of a millet 

 seed, deep red in color, and may sometimes produce a tumor which is 

 visible in the internal canthus of the eye. When the memlirane is 

 picked up and examined by means of a pair of forceps, and enlargement 

 of the meml)rane is indicated by a pink red tumor in the internal corner 

 of the eye, which moves over the eyes on slight pressure on the eyeball; 



