The economy of the eyes: precepts for the improvement and preservation of the sight. Plain rules which will enable all to judge exactly when, and what spectacles are best calculated for their eyes. Observations on opera glasses and theatres, and an account of the pancratic magnifier, for double stars, and day telescopes (1824)
with compara-tively less fatigue. The Pupil of the Eye is larger when shaded PRESERVING THE SIGHT. 87 by a Broad Brimmed Hat — such as Coachmenwear, who probably adopted this costume fromits advantage in sharpening their sight. There is no part of the Economy of theEyes more important, than that… … and hard Students will do wisely to have aHigh Desk at which they can occasionallystand — instead of always sitting. Those who are much occupied in Engraving— Painting —Writing — Reading — &c. orworks which require all the power of the Eye 88 PRECEPTS FOR IMPROVING AND to be exerted to the…
Eyeglasses · Telescopes
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