336 Observations relative to 
on a friend of his, who was near-sighted ; and he informs 
us, in the paper above referred to, that in this instance, the 
nearest point of perfect vision was moved forwards durin 
the dilatation of the pupil, whilst its remote point remained 
unaltered. I have made a similar experiment on the eyes 
of several such persons; and though in two of these the 
result appeared to be similar to that which has been men- 
tioned by Dr. Wells, yet, in the greater number, their 
sight, like that of those who were not myopic, has become 
more distant as the pupil became more dilated.—In one 
gentleman, in,whom the lines of the optometer appeared to 
meet at four inches and a quarter from the eye, the pupil, 
in half an hour after the application of the belladonna, be- 
came completely dilated, and in consequence of this the 
sight at first was confused; but both on that day, and for 
two days afterwards, it was evidently more distant, and the 
apparent lines on the optometer could not be made to meet 
nearer than seven inches from the eye.—In a young lady, 
seventeen years of age, whose right eye was so near-sighted 
that the apparent lines on the optometer met at two inches 
and three quarters from the eye, these lines, when the pupil 
was dilated (which took place in a small degree in Jess than 
half an hour), could not be made to meet in less than three 
inches and a quarter; and on the following day, the pupil 
being more dilated, the lines did not meet till they were at 
the distance of nearly four inches.—In a third instaiice, 
viz. that of a lady forty-five years of age, who had been 
remarkably near-sighted from her infancy, and for many 
years had used concave glasses of the fifteenth number, 
(which number is ground on each side, upon a tool the ra- 
dius of which ts only three inches,) the sight was become 
so confused in both eyes, that she saw nothing distinctly, 
and was unable to read letters of the size that are used in 
the printed Transactions of the Royal Society, either with 
or without a glass. In this case, after the pupils had been 
dilated by the application of the belladonna, the sight was. — 
so much improved that she was able to read a print of the 
abovementioned size at the distance of two inches with 
either eye. Ido not insist, however, on the present case, 
because, though there was not any visible opacity in the _ 
crystalline, this sometimes exists in a small degree withant 
being perceptible even to an attentive observer; and it may 
he doubted whether the amendment in the lady’s vision 
were not occasioned solely by the retraction of the iris from 
before a part of the crystalline that was not yet. become 
opaque: it being well known that the outer part of sat 
ens 
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