orthoptics
— Noun
– English
~ treatment of defects of binocular vision (such as strabismus and amblyopia) by nonsurgical measures (especially by exercises to strengthen the eye muscles)
orthoptist
— Noun
– English
~ a specialist in orthoptics
orthoscope
— Noun
– English
~ an ophthalmoscope with a layer of water to neutralize the refraction of the cornea
orthostatic hypotension
— Noun
– English
~ low blood pressure occurring in some people when they stand up
orthostatic
— Adjective
– English
~ pertaining to an upright standing posture; "orthostatic hypotension"