Fig. 7. The heterochromatic flicker photometric setup for measuring human ocular
media density psychophysically. The IL1700 radiometer is used to calibrate the
light intensity linearity of the LED light source (placed on top of the setup for the
calibration) with a LED driver situated inside of the wooden box. The PWM signal
is transmitted from a separate room for experimenter containing the Arduino Uno
connected to the control computer.