The venous system parallels the arterial system, emptying into the superior and inferior orbital veins. Generally, 4 or more vortex veins are located posterior to the equator; these are often found near the nasal and temporal margins of the superior rectus and inferior rectus muscles. Although the number and position of the vortex veins vary, the location of 2 of them in the orbit is consistent: the inferotemporal quadrant, just posterior to the inferior oblique muscle; and the superotemporal quadrant, just posterior to the superior oblique tendon.
Excerpted from BCSC 2020-2021 series: Section 10 - Glaucoma. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.