278 HUMAN PHYSIOLOGY CHAP, xvm 



14. Farsight, nearsight, and astigmatism are due to an im- 

 perfect eyeball or lens, and should be corrected by wearing 

 properly fitted spectacles or eyeglasses. 



15. The eye is a delicate and sensitive organ capable of 

 doing an immense amount of work under favorable conditions. 

 Observe the cautions mentioned above, and use your good 

 sense in all work requiring the use of the eyes. 



