PHYSICAL AND LITERARY 325 



I confented to try this new operation. Six 

 catarads luckily caft up laft fumtner in the 

 Royal Infirmary at Edmburgh, which I ex- 

 tracted in the following manner. 



The patient being feated in a chair, with 

 an affiftant at his back, to fupport his head, 

 and keep up his eye-lid, as in the old Opc-» 

 ration, the operator may ftand or fit in a 

 chair, as he finds moft convenient. 



He {hould keep down the under eye-lid 

 with two fingers of the one hand, while with 

 the other, he takes the fmall knife A (Plate 

 YW. Fig. 3.) with which he pierces the tranf- 

 parent corfiea at the external angle of the 

 eye, near to where the cornea joins with the 

 fcleroticay taking great care not to wound 

 the iris. Run the knife in a horizontal di-t 

 redion acrofs the anterior chamber, and 

 bring it out about the fame diftance from 

 the white of the eye, as where it entered ; 

 then cut that part of the cornea which lies 

 below the two orifices, as much in the iovm 

 of a crefcent as poffible, this makes the in- 

 cifion larger, and keeps the cicatrice more 

 off the fight ; lift up the flap of the cut 

 cornea with the fcoop B (Fig. 4.) or any other 

 pnvenient inflrument j introduce at the 



fanic 



