This section is from the book "Smith's Family Physician", by William Henry Smith. See also: Natural Physician's Healing Therapies: Proven Remedies that Medical Doctors Don't Know.
Persons of delicate constitutions and sedentary habits, especially if they are in the habit of writing much, or otherwise exerting their eyes on minute objects, are liable to suffer from dimness of sight; uneasiness on exposure to a strong light; and the vision of floating black specks or streaks before the eyes. Those symptoms evidently depend on weakness of organization, either original, or produced by over-exertion.
The eyes should never be used too long at a time, They may be bathed frequently with the. Zinc Lotion. The patient should take tonics, especially the Citrate of Iron and Quinine with five grains of the Compound Rhubarb Pill at bedtime, and the occasional use of the shower bath, if the weather will allow of it,