GLAUCOMA 129 



until all signs of irritation have subsided, and in 

 using mild antiseptic collyria. 



Diseases of the Retina 



Diseases of the retina are not common in dogs, 

 the two diseases of this nature most frequently met 

 with being detachment of the retina and hemorrhage, 

 both being generally the results of traumatisms. 

 Beyond allaying pain and irritation very little can 

 be done in the way of treatment, blindness always 

 being the result in the first instance, and generally 

 in the second. 



Glaucoma 



This name is given to a group of eye symptoms 

 characterized by periodical obscurations of vision 

 in association with an increase of intraocular ten- 

 sion, haziness of the cornea, dilatation of the pupil, 

 pericorneal venous injection, and a dull purplish 

 discoloration situated around the margin of the 

 cornea. At times this condition may be accom- 

 panied by agonizing pain ; at others no discomfort 

 is manifested, but there is a gradual loss of vision. 



When the disease has recurred frequently, excava- 

 tion of the intraocular end of the optic nerve takes 

 place and atrophy of the entire eyeball ensues. 



There is often total or partial anesthesia of the 

 cornea and a characteristic rigidity of the whole eye 

 to the touch. 



Treatment. — Treatment is unsatisfactory, but may 

 delay or even inhibit the progress of the disease. 



Twenty-four hours previous to operation the pupil 

 should be widely dilated with eserin frequently 

 instilled into the eye. 



Operation. — With the patient under a general 

 anesthetic and with the usual precautions as to 

 asepsis, a narrow knife is entered at the cornea- 



