56 OPHTHALMOLOGY FOR VETERINARIANS 



Union readily takes place, and the sutures may be 

 removed in about four days. 



One should not be too ready to do this operation, 

 as nature may perform her work, if given sufficient 

 time, in the case of all pet animals. 



Ptosis. — Panas' operation for ptosis is probably one 

 of the most popular. Posey gives an excellent descrip- 

 tion of the operation as follows: ''Two horizontal 

 incisions are made, the lower at the orbital margin, 

 and along the top of the flap with a sHght convexity 

 upw^ard, and not quite an inch long; the higher one a 

 Httle longer, and at the upper border of the eyebrow. 

 A flap of the skin and muscle is now dissected from the 

 tarsus down to the cihary border, but the septum 

 orbitce (suspensory ligament) of the lid is not disturbed. 

 The bridge of tissue between the two horizontal in- 

 cisions is undermined without cutting the periosteum or 

 septum orbitae. The flap is then drawn up under the 

 bridge by means of sutures and fastened to the upper 

 edge of the higher incision. When the flap is so fixed, 

 the traction tends to cause ectropion, and a suture is, 

 therefore, placed at each side, passing deeply through 

 the septum orbitae and conjunctiva, but not the skin, 

 and it also is inserted in the upper lip of the higher 

 incision, so as to correct the tendency to eversion." 



