EFFECTS OF RADIANT ENERGY ON THE EYE. 643 



Experiments. 



Subliminal Exposures Repeated after 24 Hours. Quartz Mercury 

 Vapor Lamp. Distance .5 Meter. 



Experiment 27. Right eye. Exposed 1 minute every day except 

 Sunday for 52 days. (44 exposures.) Result: No reaction through- 

 out the experiment. Three days after last exposure; each eye 

 exposed six minutes. Result: Moderate reaction in each e3'e, but 

 greater in the left eye. 



Experiment 28. Left eye. Exposed 2 minutes every other day, 

 except when Sunday intervened. Results: After 7 exposures, slight 

 stippling of corneal surface. After 9 exposures, slight haze of 

 cornea. After 1 1 exposures, haze of cornea gone. After 28 expos- 

 ures, cornea clear, no stippling. After 33 exposures cornea clear, 

 exposures discontinued. Nine days later, each eye exposed six min- 

 utes. Results: Right eye, marked reaction. Left eye, much less 

 reaction. 



Experiment 29. Left eye. Exposed 2 minutes every day except 

 Sunday. A speculum was used at first but caused ectropion of the 

 lid and was soon dispensed with. Results: No reaction until sixth 

 exposure when there was slight conjunctivitis and stippling of the cor- 

 nea. After 14 exposures the conjunctival reaction had disappeared 

 but the cornea was distinctly hazy in the centre. After .34 exposures 

 the central haze of the cornea was marked and the epithelial surface 

 showed a number of fine irregular ridges. Exposures discontinued. 

 Forty days later only a barely visible opacity of the cornea remained. 

 Enucleation. Microscopic examination shows Bowman's membrane 

 absent in places, and proliferation and irregular arrangement of the 

 superficial corneal corpuscles. 



Experiment 30. Left eye exposed 3 minutes. After 24 hours, no 

 reaction. Left eye exposed 3 minutes. Right eye exposed 6 minutes. 

 Results: Reactions equal in two eyes. 



Experiment 3L Right eye exposed 5 minutes. Result: No re- 

 action. Two weeks later. Right eye exposed 4 minutes. Result: 

 Slight reaction. 



The next series of experiments had to do with the effect of previous 

 reactions upon the sensitiveness of the eye to subsequent exposures. 

 It was found that previous reactions rendered the eye more sensitive 

 for at least one month, thus reducing the time of exposure necessary 



