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].

  • Beer, Georg Josef, 1763-1821
Date:
1828
Catalogue details

Licence: Public Domain Mark

Credit: 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]. Source: Wellcome Collection.

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    Whatever injury, however, a person may receive from inhabiting a dark apart- ment, he will not be exposed to less, but to the contrary, if he adopts one where the windows look upon a whitened wall on which the sun’s rays fall direct; a cir- cumstance from whence the most obsti- nate inflammations often arise.* Of this, * That reflected light, though less intense than the direct rays of the sun itself, is yet more hurtful to the eyes, has been long acknowledged as a fact by all writers on the subject. The French philosophers have paid considerable attention to this branch of science; and some obser- vations of Bouguer on this point may tend to con- firm the propriety of the cautions in the text; par- ticularly as the extreme simplicity of the Regimen and Cure for Optical Diseases, as detailed in the first edition of this work, has in one or two instances failed in affording conviction to those who are more influenced by the high-sounding promises of quack- ery than by plain rules, which, in a popular point of view, profess only to assist, and not to force the operations of nature. That the quantity of rays reflected from a whitened wall, independent of the confusion produced upon C