[ HO ] 



tion, except that it cuts at both fides from its point, and that 

 the incifive parts are a little convex, the concave or infide of 

 which fliould be marked in the handle. With the concave part 

 next me, I pierce the sclerotica, very near the edge of the 

 cosNEA — fuppofe the third of a line — at either the external or 

 internal canthus, according to the eye to be operated on. Inftead 

 of pufhing it on in a ftraight line, as recommended, I dired the 

 point rather a little tovvards the aqueous chamber than the iris, 

 for fear of wounding this laft, which its rifing convexity expofes 

 it to. The paffagc of the needle is proved by part of the aqueous 

 humour's efcape, and by your feeing its point, within the cornea, 

 between it and the iris. You now incife the inferior fide of the 

 fclerotica, advancing the incifion to the edge of the cornea 

 tranfparens, as the adherence between the iris and fclerotica ap- 

 proaches clofcr to the cornea, the farther you go from the fides 

 of the eye. Without withdrawing the inftrument you cut the 

 upper fide of the fclerotica in the fame manner. The reafon why 

 the inferior incifion is firft performed is, that if you cut the 

 upper fide firft a little blood might oppofe your carrying this 

 inferior opening fo very accurately afterwards. Thus nearly 

 one fide of the fclerotica from top to bottom, at its jundion 

 with the cornea, becomes divided j with the point of this very 

 inftrument you prick the cryftalline capfula, and the fmalleft 

 inclination of it infide the pupilla will do this, and then gently 

 prefs on the globe of the eye, the catarad will inftantly flip out, 

 and though divided into parts, as it is fometimes, will with the 

 greateft facility be extraded through the aperture. 



Br 



