EFFECTS OF RADIANT ENERGY ON THE EYE. 683 



mydriatic having accidently gotten into the left eye. Animal has 

 great difficulty in getting around, vision evidently being much im- 

 paired. After one hour vision is much improved; the animal follows 

 the observer with the eye. March 29, 1913. Cornea clear. Well 

 marked lid reflex to flash light. Consensual pupillary reaction also 

 well marked. Visual acuity of animal apparently normal except that 

 animal has difficulty in catching flies owing to eft'ect of cycloplegia. 

 After several days, the mydriasis having disappeared, the animal is 

 able to catch flies with her usual dexterity. 



Experiment 94b. December 4, 1913. Old female monkey. Right 

 eye exposed 1^ hours. One minute after end of exposure there is a 

 barely perceptible consensual pupillary reaction. After six minutes 

 the reaction is well marked. Animal now released. Cannot see 

 approach of observer's hand. Is compelled to feel her way to her 

 perch in the cage. After one hour she is still apparently blind ; can- 

 not see a carrot held near her, although she takes it when placed 

 against her mouth. After seven hours, vision is still impaired. 

 December 5, (18 hours). Cornea clear. Vision apparently normal — 

 sees carrot, avoids hand movements etc., even in poorly illuminated 

 cage. Consensual pupillary reaction normal. After the mydriasis 

 has disappeared the animal catches flies as usual. 



Experiment 94c. February 5, 1914. Young monkey. Right eye 

 exposed 1| hours. Three minutes after beginning of exposure the 

 consensual pupillary reaction, tested with flash light, is absent. 

 Immediately after end of exposure the lid reflex to flash light is present, 

 but the consensual pupillary reaction is absent. At the end of three 

 minutes the latter is distinctly visible, and in six minutes is well 

 marked. Animal now released, finds his way at once to perch, avoids 

 hand of observer — evidently sees well. One hour after exposure 

 the eye lids of right eye are sewed together. When released the 

 animal cannot find his way about and is easily caught, thus showing 

 that if the sight of the right eye had been affected the fact would 

 have been easily determined. February 6. There is a small abra- 

 sion of the cornea probably due to the animal having frequently 

 rubbed his eye as a result of a slight irritation produced by the sutures. 

 Cornea clear. Consensual pupillary reaction intact. Animal sees well. 

 February 7. The abrasion of the cornea is healed. Consensual 

 pupillary reaction intact. Animal shows no evidences of poor vision. 

 After the mydriasis has disappeared the direct pupillary reaction to 

 light is normal and the animal seems to have normal vision. 



The results of these experiments show that even with exposures of 



