THE EYE AND EYELIDS 117 



Treatment. — If disco\-ered within a fe\\ moments after it 

 has become displaced and its return can be accomphshed, this 

 should be done, and a mild astringent lotion (such as zinc 

 sulphate, i or 2 grains to the ounce) applied for a few 

 days. 



If medicmal treatment fails, the parts should be painted 

 with cocaine or some local anaesthetic, and excised with a 

 pair of sharp scissors. 



Prognosis is excellent, and the application for a few da)'s 

 of a mild antiseptic completes the cure. 



Entropion and Trichiasis. 



The term ' entropion ' is given to a condition in which the 

 edges of the e)'elids turn inwards ; the term ' trichiasis ' is 

 applied -when the e3'elashes turn inwards ; frequently both 

 conditions are present at the same time (districhiasis). 



Symptoms. — Both conditions are usually congenital, and 

 ma\-, if not relieved, gi\e rise to opacit}' of the cornea and 

 total blindness from the constant irritation produced. Even 

 in mild cases there is usually an objectionable watery or 

 mucous discharge, which is more abundant the first thing in 

 the morning, and the patient frequenth' irritates the eye by 

 rubbing it against the ground or with its paw. 



Operation. — The patient should be secured in the 

 abdominal position, and the head held firmh- by an 

 assistant. The hair is removed as closely as possible from 

 the external surface of the eyelid b}' shaving, and the 

 parts are then anaesthetized with cocaine, or the animal 

 is placed under the influence of some general anaes- 

 thetic. An elliptical piece of the offending eyelid is 

 then removed either \\ith a pair of scissors or a scalpel, great 

 care being taken to remove only the skin, and not to injure 

 the mucous membrane lining the lid. The wound is then 

 sutured with fine silk, catgut, or silkworm gut covered \\ith 



