240 BIOLOGY AND HUMAN LIFE 



Protection of eyes 



Mechanical injuries Infection 



Illumination Kinds 



Glare Trachoma 



Flicker Blindness in babies 



Poor lighting Prevention 



QUESTIONS 



1. What are the chief dangers to which our special sense organs are 

 exposed ? 



2. How do modern living conditions bring special dangers to our sense 

 organs ? 



3. What are the ordinary symptoms of eyestrain ? How can you tell 

 that they are due to eyestrain ? 



4. What are some of the advantages of properly fitted eyeglasses ? the 

 disadvantages ? 



5. How can difficulty in hearing affect the health ? 



6. What help can be found for people who are hard of hearing ? 



7. Why should legal regulations be established regarding the lights in 

 public places, in factories, and on automobiles ? What objections are 

 there to such regulations ? 



8. What regulations (statutes or ordinances) are there in your com- 

 munity designed to protect people's special sense organs ? 



9. What arrangements are made in your school on account of the 

 great individual variations among eyes and ears ? 



REFERENCE READINGS 



Hough and Sedgwick. The Human Mechanism, chap, xxii. The Care 

 of the Eyes and the Ears. 



Public Health Bulletin 140, Studies in Illuminations. 



United States Bureau of Education. Bulletin 65 (iqiq)- Defective 

 Vision, Methods of Prevention and Correction. 



Supplement 8, PubHc Health Reports. Trachoma, its Nature and Pre- 

 vention. 



Bureau of Standards. Technological Paper 93, Glasses for Protecting 

 the Eyes from Injurious Radiations. 



