304: DISSECTION OF EYE. 



receive the lens, which sometimes pops out suddenly. AVitli 

 a sharp knife make a quick, light gash across the surface of 

 the lens to cut through the thin coat which envelops it, the 

 Lens Capsule. Usually the lens may be made to come out 

 by applying gentle pressure to the sides of the eye with the 

 thumb and finger. If not, enlarge the opening thus made, 

 and carefully pry out the lens with the handle of the forceps, 

 noting closely, in so doing, the difference between the front 

 and back surfaces. Lay the lens on the piece of newspaper, 

 and look through it at the letters. Make a drawing of the 

 lens as seen from the front, and as seen from one side, naming 

 the front and back surfaces. 



8. In removing the strip of eye-coating, as directed below, 

 be extremely careful not to drag the clear jelly-like vitreous 

 humor. The parts must be lifted gently by the forceps, and 

 if the clear jelly-like mass adheres, it must be cut through, 

 horizontally, with the scissors. With the scissors now cut 

 outward about one-half of an inch from the edge of the hole 

 made in the front of the eye ; then cut clear around the eye 

 and remove a strip of this width, thus enlarging the opening 

 before made. On the inside of the strip removed there may 

 be found radiating black ridges, the Ciliary Processes. 



9. Carefully pick away with the forceps, and snip away 

 with the scissors, everything on the surface of the clear mass 

 beneath. 



10. The substance filling the remainder of the eye-cavity is 

 the Vitreous Humor. 



11. Through the vitreous humor the entrance of the optic 

 nerve may be seen with the blood tubes radiating from it. If 

 necessary, carry the dissecting board to a window to let the 

 light enter from above. 



12. The tough outer coat of the eye is the Sclerotic Coat. 



13. Inside the sclerotic is the dark Choroid Coat. 



