The art of preserving the sight unimpaired to an extreme old age : and of re-establishing and strenthening it when it is become weak ... To which are added observations on the inconveinces ... of common spectacles / By an experienced ocultist [G.J. Beer].

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The art of preserving the sight unimpaired to an extreme old age : and of re-establishing and strenthening it when it is become weak ... To which are added observations on the inconveinces ... of common spectacles / By an experienced ocultist [G.J. Beer]. Public Domain Mark. Source: Wellcome Collection.