Amblyopia, optic nerve hypoplasia and strabismus can cause loss of depth perception. Or a person suffering from an injury to one eye or missing one eye can not be able to tell where objects are, how far objects are from him and how far he needs to move to reach or avoid them, either. People with loss of depth perception have difficulty in seeing the environment in three dimensions and estimating the spatial distances of objects from themselves and others so that they cannot perform activities nicely such as driving, sewing, threading a needle, watching 3D movies, walking on uneven ground and other activities that require depth acuity. If you suffer from reduced depth perception, you should consult your ophthalmologist to conduct visual therapy.