Seeing things in both eyes in a darker and lighter color can be caused by a variety of reasons, such as cataracts, central plasma choroidal retinopathy, etc. Cataracts can be treated by surgical removal of the cataracts, and central plasma choroidal retinitis can be treated by oral lecithin complex iodine tablets and other medications. When a cataract causes a difference in the density of the lens in both eyes of the patient, there is a difference in the depth of the color of what is seen. If this is combined with a loss of vision, the cataract can be treated by microscopic surgery to remove the cataract. Central plasma choroidal retinopathy, usually monocular, will lead to the affected eye to see things in light color, can be treated by oral lecithin complex iodine tablets and other drugs. If you have two eyes with dark and light colors, you need to consult an ophthalmologist for a clear diagnosis and treatment.