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VIII. An Explication of the Injlruments ufed , in a 
new Operation on the Eyes , by the Same. 
A B TJ Eprelent the Figures of two Eyes, on which 
IV a new Operation was perform’d, by mak- 
ing an Incifion thro’ the Iris , which had contracted it- 
felf in both Cafes fo clofe, as to leave no Pupil open 
for the Admilfion of Light. (See Tlate the x d .) 
The Perforation in the Eye A was made a little a- 
bove the Pupil, the doling of which enfued upon the 
putting down a CataraCt, which not knowing how low 
it might be lodged, I made the Incifion a little higher 
than the Middle, left any Part of it fhould lie in the 
Way. 
The Eye B was one I couch’d not long before, 
where the Patient had been blind but a few Years. At 
firlt he thought every Objed further from him than it 
was ; but he loon learn'd to judge the true Difiance, 
the Caufe of which I lhall endeavour to explain by the 
lowermoft Figure, in which let the Circle H I K re- 
prelent the Eye, H the Place where an Image through 
the natural Pupil 1 was reprefented from the Place M * 
now the artificial Pupil being at the Place K, the Ob- 
ject at L is now painted at the Place H, where the 
Objecfi M was alfo to be perceiv’d ; therefore it was. I r 
fuppofe, that the Patient miftook the Place L for the 
Place M. 
