RIO full form in medical term is Right Inferior Oblique. IO is a narrow, thin muscle found near the frontal margin of the ground of the orbit. It is jointed to the inferior, posterior, and lateral bottom of the eye and maxillary bone and is one amongst the extraocular muscles. These muscles are vital for ocular movement. The inferior Oblique is majorly responsible for external rotary motion.
It is the tinniest of all the eye muscles, calculating about 37 mm long. As opposed to other extraocular muscles, IO doesn’t originate from the annulus of Zinn. It is known as having two surfaces: the ocular and inferiorly surface and the orbital surface.
In RIO, a person may have small left hypertropia in the first position, increasing left gaze with a bias to the left.
Inferior Oblique muscle obtains blood supply from a muscular medical brand of the infraorbital and ophthalmic arteries. The role of the inferior oblique is to elevate, rotate, and abduct the eye. If there is an injury to this muscle, it can lead to strabismus. In simple words, it can cause additional injury that is noticeable enough.