Methods, systems, and devices related to light therapy using ophthalmic lenses are disclosed. In one example aspect, an optical device includes at least one light source, and a system of light guiding optics configured to direct a light from the at least one light source to a back of a human retina for different therapeutic effects. The light entering the human retina is configured to span a field of view that is approximately up to 220 degrees horizontally and 135 degrees vertically, and the light entering the human retina from the at least one light source is controlled in a manner to avoid a central area that is around +/−10 degrees from a center of the human retina.