Click (or click-drag) the arrow near the top to change the wavelength of light landing on the retina. The specific wavelength is read out on the right.

Change from chromatic to achromatic stimuli by selecting the "white light mode" checkbox

Adjust the window of light over the cones by clicking the trapezoid just below the arrow.

PERFORM THE GENE THERAPY EXPERIMENT: Make sure program is off white-light mode and that the window is allowing light to fall on the whole retina. Then click "protanope" on the right and then let the ramp take you through the entire range of wavelengths. Select "trichromat" and repeat the ramp. Notice the new perceptions with no need for rewiring.