Treatment apparatus and method for the enhancement of neurophysiological processes of a patient’s visual system utilizes a computer generated display that provides a patient simultaneously with passive visual stimulation images and visual cognitive exercises. In particular, embodiments of the present invention describe new 3-4 component combinations of peak wavelengths and bandwidths for white PC LEDs with partial conversion. Then, pressure is applied to the water feed, or where the pressure of the water feed is higher than desired, the pressure is controlled or reduced.