(4) Do not allow children to keep their eyes too long on a near object, at any one time.
(5) Do not allow them to study much by artificial light.
(6) Do not allow them to use books with small type.
(7) Do not allow them to read in a railway carriage.
(8) Do not allow boys to smoke tobacco, especially cigarettes.
(9) Do not necessarily ascribe headaches to indigestion. The eyes may be the exciting cause.
(10) Do not allow the itinerant spectacle vender to prescribe glasses.
A lecture delivered before the Franklin Institute, December 5, 1890.—From the Journal of the Institute.