SIGHT. 



85 



Fig. 78.— Ophthalmoscope. 



The speculum to keep the eyelids apart wiU be found of great 

 assistance ia the examiaation of that organ, so sensitive to the 

 Ught when in a state of disease, and so constantly kept closed on 

 that account. It is, in fact, this speculum which renders the use 

 of the ophthalmoscope practicable for the examination of the in- 

 ternal structures of the ocular globe. 



Some of the various patterns of the speculum used in human 





Fig. 79.— Examination of Dog's Bar. 



