THE SKIN. 175 



CARE OF THE EYES. 



16, 1. If the eyes are tired and hot, it is a sign that 

 they have been used too long. Stop until they are rested. 



2. Do not try to read when there is not light enough. 

 If the light is dim, the book will be held too near the eyes. 

 This tires them, and causes short sight. Reading by a 

 Jading tivilight is particularly bad. 



s. The light should not be too glaring. If it is, the 

 nerve is stimulated too much. This tires it. Besides, 

 when any nerve is over-stimulated, it loses its sensitiveness 

 after a time; and then the book will be held too near, and 

 short-sightedness may result. 



For the same reason, the light should, if possible, fall 

 over the left shoulder on the page. Then it will not be 

 all reflected into the eyes, as when it comes from in front. 



4. The light should be steady. A flickering light keeps 

 the eye annoyed, and tires it with constant changes. 



5. The book and the eye should be steady. It is as 

 wearisome to the eye to have the page or the head in con- 

 stant motion as to have the light flicker. Heading in the 

 cars is trying to the eyes. 



6. The upright position is the natural and easy one for 

 the eyes. To read when lying down, or with the head 

 hanging over the book, tries the eyes, and tends to short- 

 sightedness. 



7. Any serious trouble with the eyes should be attended 

 to at once. It is better never to open a book than to lose 

 the use of the eyes. If study can not be continued with- 

 out ruining the eyes, abandon study. 



