( » 0I<> ) 
A<\»ms Humour, converge, and .meet cither in the 
Vitreous, or Cryftallihe Humour, according to the 
Convexity of rhe CornzA thro’ which they pafs^d, and 
diverge again before they come to the Rttim ; the 
Rays of each Pencil converging upon their refpedive 
Axes, to the place where the faid Axes crofs one ano- 
ther, Fig, 
Dmonjlration, 
The Axes aQa, aCa, falling obliquely upon the 
(Cornea at C,C, and entring from Air into the Aqueous 
Humour, will be refraded towards the Perpendicular 
to K : v/here ftriking more diredfly upon the Cry- 
flalline , they will go on to a, a, upon the Retim 
R R R R, decuflating at V within the Vitreous Humour, 
The other Rays r, r ; js, after their Refradion in the 
Aqueous Humour, fall more obliquely on the Cr^jlalline^ 
and therefore are refraded again fo as to meet at V, 
where the Axes alfo meet, and thence go on to the Re- 
iina R R R R, Fig. 4. 
Lemma 4, 
But if the Axes of the above-mention’d Pencils are 
Parallel, the Rays that accompany them diverging 
from a Point fo near the Eye, that the divergence may 
be proportionable to the too great Convexity of the Eye ; 
then only the Axes will meet in the Eye before they 
come to the Retina (by Lemma j.) but the other Rays 
will not unite upon their refpedive Axes^ till they 
come to the Retina ^ (by Lemma 1.) 
Fropo/ftion, 
I fuppofe the Eye of the Myops fo Convex that he 
can fee no farther than a common Eye, with the Eye- 
Glafs of a Tekfeope before it ; then the Eye of the 
p S Myops 
