It supplies nutrients for the inner part of your eye.
iris
Choriod
The ventricles contain something called the Choriod plexus. The cells of this plexus produce the cerebrospinal fluid (CSF). This fuid fills the ventricles and flows down into the spinal chord as well around the subarachnoid space holding the brain suspended.
When the choroid layer separates from the neural layer of the eye, it can lead to a condition known as retinal detachment. This separation disrupts the supply of nutrients and oxygen to the retina, potentially causing vision loss and damage to the retina's photoreceptor cells. Symptoms may include sudden flashes of light, floaters, or a shadow over the visual field. Prompt medical attention is crucial to prevent permanent vision impairment.