ON THE ESSENTIAIi ORGANS OF SIGHT. 



755 



Fig. 549.— How to Protect the Eye. 



Ocular Prothesis. 



The animal which has undergone the preceding operation is 

 considerably deformed, but the difficulty is easily remedied by the 

 insertion of an artificial eye. 



Artificial eyes for horses were first introduced by Schmidt in 

 1850. They were originally made of glass, but many varieties of 

 material have since been used, and to-day all instrument-makers 

 probably keep them in stock, of hard rubber and gutta-percha, 

 etc. By the skillful use of pigments the artificial organ can now 

 be made to so closely match its living companion as to be undis- 

 tinguishable from that Avhich the animal has always carried (Figs. 

 550 and 551). 



But the artificial organ must not be introduced into the orbital 



Figs. 550, 551.— Artificial Eye— side and full view. 



