The macula responsible for central vision and the anterior part of the optic nerve are dependent on choroidal blood supply.

[5] Teleosts bear a body of capillary adjacent to the optic nerve called the choroidal gland.

[7] Melanin, a dark colored pigment, helps the choroid limit uncontrolled reflection within the eye that would potentially result in the perception of confusing images.

The uncontrolled reflection of light from dark choroid produces the photographic red-eye effect on photos, whereas the controlled reflection of light from the tapetum lucidum produces eyeshine (see Tapetum lucidum).

[10][11] Choroid is the most common site for metastasis in the eye due to its extensive vascular supply.