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According to my experience no higher visual acuity can be attained by use of the amblyopic eye, than that which is best detected by the aid of eserine in the first examination, if it is only carried out thoroughly enough.

Eserine and separate use were prescribed.

In a case of visual acuteness of 1/12 No. 0·75 with convex 6 was the smallest type that could be read, and that with difficulty, larger type was usually required; and in one case where at first only single words of No. 2·25 were read with difficulty—this test was on that account repeated in myosis by eserine—No. 1·75 was finally the smallest print which could with the same difficulty be deciphered.

Accurate reports are usually obtained more quickly by means of convex glasses or eserine.

Of these two have been identified, one called calabarine, and the other, now a highly important drug, known as physostigmine—or occasionally as eserine.