Abnormal, harmful, or undesirable effect on an organism that causes anatomical or functional damage, irreversible physical changes, or increases the susceptibility to other biological, chemical, or environmental stresses.
Optometrists can prescribe glasses, contact lenses, eye exercises, vision aids and therapy, and (in some states) oral and topical medications to treat certain eye diseases. Ophthalmologists are doctors of the eye. They have graduated from medical school and are licensed to practice medicine, so their credentials are either doctor of medicine (MD) or doctor of osteopathy (DO).
Your online psychiatrist can prescribe medication for you. The psychiatrist must be licensed in the state where you are located. Psychiatrists are physicians who can prescribe medications as well as facilitate psychotherapy and other treatments for mental health problems. Online psychiatrists evaluate and treat patients via secure internet videoconferencing (telemedicine or tele-psychiatry).