Some people with a rare medical condition known as “superior canal dehiscence syndrome” can actually hear their eyeballs move.
Superior canal dehiscence syndrome (SCDS) is a rare condition affecting the ear which causes the person having it to hear sounds inside their body, among other things.
Patients with SCDS-related autophony report hearing their own voice as a disturbingly loud and distorted “kazoo-like” sound deep inside the head as if relayed through “a cracked loudspeaker.” Additionally they may hear the creaking and cracking of joints, the sound of their footsteps when walking or running, their heartbeat and the sound of chewing and other digestive noises. Some sufferers of this condition experience such a high level of conductive hyperacusis that a tuning fork placed on the ankle will be heard in the affected ear.
The bizarre phenomenon of being able to hear the sound of the eyeballs moving in their sockets (e.g. when reading in a quiet room) “like sandpaper on wood” is one of the more distinctive features of this condition and is almost exclusively associated with SCDS.