The Art of preserving the sight unimpaired to extreme old age; and of re-establishing and strengthening it when it becomes weak. To which are added observations on the inconveniences and dangers arising from the use of common spectacles / By an experienced oculist [i.e. G.J. Beer].

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The Art of preserving the sight unimpaired to extreme old age; and of re-establishing and strengthening it when it becomes weak. To which are added observations on the inconveniences and dangers arising from the use of common spectacles / By an experienced oculist [i.e. G.J. Beer]. Public Domain Mark. Source: Wellcome Collection.