32 OPHTHALMOLOGY FOR VETERINARIANS 



Always try the tension of the eye with the bulbs of 

 the index-fingers. Place both fingers over the upper 

 lid, above the cornea, and make gentle pressure. A 

 sense of normal tension can only be acquired by prac- 

 tice. An increased tension indicates glaucoma, while 

 a decreased tension is the result of a fluid vitreous. 



