The FDA is the United States government agency responsible for the evaluation and approval of medical devices. Ghost Image is a fainter second image of the object you are viewing. Glare is scatter from bright light that decreases vision. Halos are rings around lights. Haze is corneal clouding that causes the sensation of looking through smoke or fog.
Hyperopia is the inability to see near objects more clearly than distant objects.
Inflammation may be caused by mechanical trauma, infections, bacteria, viruses, immune reactions or other causes. Iris is the colored ring of tissue suspended behind the cornea and immediately in front of the lens. Keratectomy is the surgical removal of corneal tissue. Keratitis is the inflammation of the cornea. Kerato is the prefix indicating relationship to the cornea.