1. A method for detecting functional areas in retinal images comprising: illuminating a hemifield of the retina using a stimulating wavelength; illuminating the entire retina at a non-stimulating wavelength; simultaneously recording the resultant reflectance of the stimulated hemifield of the retina and the non stimulated hemifield of the retina in the non-stimulating wavelength region; and determining functional areas of the retina based upon reflectance differences in the stimulated and non-stimulated hemifields in the non-stimulating wavelength.