HOW TO USE THE EYES.
Never strain the eyes by trying to read or examine anything closely when the light is poor. When it becomes an effort to see distinctly, cease the effort at once. A strong glare of light is also hurtful.
In reading or study, do not permit the light to fall on the page from the front. It should pass over the shoulder, the left being preferable. It is well also to wear a shade over the forehead, especially when writing at night, and it is necessary that the light should come from the front, on account of the shadow made by the hands.
When the eyes become weary and the letters or figures begin to dance and flicker, cease work. If a cinder lodges under the lids, do not attempt to remove it by rubbing; that only adds to the irritation. Close the eye and then carefully draw the upper lid over the lower. This will cause a flow of the fluid of the eye which will probably wash away the substance.
If this fails, a friend is not likely to have any trouble in removing the object with the corner of a silk handkerchief. Should he find it impossible to relieve you, go without delay to an oculist.
Sometimes the eyes of children have been weakened by sickness, and it is necessary to use spectacles. When a boy or girl feels any peculiar sensation about the eyes, or they seem to act wrongly, the oculist should be appealed to at once.