18 PRACTICAL PHYSIOLOGY 



Examine again, using a Phakoscope as demonstrated. (Figs. 7 and 8.) 



FIG. 7. The phakoscope. 



Make a diagram of the results arrived at. Which refracting 

 surface is changed? 



FIG. 8. Diagram of the course of the rays of light in the phakoscope. 



This experiment shows that neither the anterior surface of 



the cornea nor the pos- 

 terior surface of the lens 

 undergo any change in cur- 

 vature. The image from 

 the anterior surface of the 

 lens becomes smaller and 

 seems to approach that 

 from the cornea. It is the 



FIG. 9. To show the changes in the lens anterior surface of the lens 



and in the pupil in positive accommodation. M ^ becomes more COn- 



(FromNoa Paten's Essentials.) 



more divergent rays from objects near the eye to a focus on 

 the retina, 



