VISION 205 



(5) Observe alternately the three conditions indicated above until 

 their differences are so familiar that any one of the conditions 

 may be readily and unerringly detected by the observer when they 

 are arranged for him by the instructor. 



(c) Observation of the Hyperopic Eye. Adjust the model to repre- 

 sent any degree of hyperopia. 



(6) Note that for a low degree of hyperopia the shadow movement 

 is with the mirror rotation and quick. 



(7) Note that for higher degrees of the condition the shadow move- 

 ment is with the mirror and slow. 



(8) How may one differentiate a high degree of myopia from a high 

 degree of hyperopia? 



(9) Is there any difference in the size, shape, distance, or position 

 of the shadows in these two conditions? 



(d) Observation of the Human Eye. Let the student practice upon 

 his comrades. 1 



1 Observation of the astigmatic eye is intentionally omitted here. It belongs more espe- 

 cially to the clinical phase of the subject. 



