Eyestrain (commonly called asthenopia) / by Ernest Clarke.

  • Ernest Clarke
Date:
1892
Catalogue details

Licence: Public Domain Mark

Credit: Eyestrain (commonly called asthenopia) / by Ernest Clarke. Source: Wellcome Collection.

    40/184 (page 28)
    percentage of asthenopia in emmetropia was 21 per cent., arid that this steadily rose to 72 per cent, in myopic astigmatism, and 74 per cent, in mixed astigmatism, I have in fig. 2 made a table showing the relation of asthenopia to the refraction, from my own cases. I have taken these from my private case-book, because the notes Fig. I. were fuller and the examination more complete. Out of 317 cases 105 suffered from asthenopia, that is, one-third. Comparison of the American table with mine reveals some important differences. I only show 2 per cent, of emmetropic asthenopia, whereas fig. i shows 21 per cent. At first I thought that my low percentage was due to the