174 
important intensities of fatigue the direct irritation does not likewise 
cause over-compensation, and if at greater intensities, on the contrary 
the consensual irritation cannot likewise bring about such effects. 
At the end we should compare the corresponding progress curves 
with the direct binocular and direct monocular penetration. We can, 
when doing so, sum up the deeper decrease of the limit values under 
the norm, the ulterior reaching of this norm and their afterwards 
coming higher above the norm, as a sympton of greater fatigue. 
The contemplation of table II] added here teaches as follows: 
TABLE Ill. Comparison of the results of the binocular and 
the monocular irritation of fatigue. 
Duration of 
the Fatigue 
f lhe. 
Wering 
li ght 
g/ 
Deeper under 
pee 
firme [= [8 
bere ales 
EES RENE 
EEN 
B - Binoculac Arrifafion 
M - Monocular of fatigve 
Higher over- 
Compe nsalion 
Norm reached 
aflerwaras 
o 
DS = 
~> 
EE 
2 
ee : oS 
In our determinations the monocular irritation relatively brings about 
somewhat greater effects of fatigue than the binocular one. At all 
events the binocular irritation is not accompanied by greater effects 
than the monocular one. Consequently there does not exist a binocular 
summation of the irritation of the visual fatigue, which corresponds 
well with the analogous denial of the binocular summation of the 
subjective brightnesses (RorLors and ZEEMAN). 
