Ocular Photo-Bio-Stimulation Optics

A device for providing extended reality, comprising a light source providing light to stimulate a retina of an eye of a user of the device, wherein the light is chosen to result in a physiological response in the user's eye or a body of the user, wherein the device causes the user to see a first lighted image and a second lighted image with a user's same eye, wherein the device projects the first lighted image having light wavelengths that are substantially within a wavelength range comprising at least one of 480 nm+/−30 nm, 475 nm+/−20 nm, 530 nm+/−20 nm, or 650 nm+/−30 nm, wherein at a same time as the user fixates on the second lighted image with the user's same eye, the first lighted image paints light wavelengths that are substantially within the wavelength range comprising at least one of 480 nm+/−30 nm, 475 nm+/−20 nm, 530 nm+/−20 nm, or 650 nm+/−30 nm, across or on different areas of the retina of the user's same eye.