Change Effect to low number

addons/ACE/settings/nightvision.sqf

 force force ace_nightvision_aimDownSightsBlur = 0;
-force force ace_nightvision_effectScaling = 0;
+force force ace_nightvision_effectScaling = 0.1;
 force force ace_nightvision_fogScaling = 0;
 force force ace_nightvision_noiseScaling = 0;
 force force ace_nightvision_shutterEffects = true;