Visual snow

Visual snow, visual static, or persistent visual snow is a transitory or persisting medical disorder in which sufferers see snow or television-like static in parts or the whole of their visual fields, constantly in all light conditions, even visible in daylight, darkness and with closed eyelids. The severity or density of the “snow” differs from one person to the next. 

Visual snow is now regarded as a unique syndrome—usually presenting with other symptoms, such as persistent afterimages, photophobia, enhanced blue field entoptic phenomenon and tinnitus. There is no established treatment for visual snow.

In addition to visual snow, many of those affected have other types of visual disturbances:

Closed-eye hallucination –  these types of hallucinations generally only occur when one’s eyes are closed or when one is in a darkened room. Those who suffer from closed-eyes hallucinations may see: visual snow, light/dark flashes, patterns, motion, and colours, objects and things.

Blue field entoptic phenomenon – 

is the appearance of tiny bright dots moving quickly along squiggly lines in the visual field, especially when looking into bright blue light such as the sky.

The dots are white blood cells moving in the capillaries in front of the retina of the eye.

Palinopsia – 

is a visual disturbance defined as the persistent recurrence of a visual image after the stimulus has been removed.

Phosphene – 

is a phenomenon characterized by the experience of seeing light without light actually entering the eye.

Floater – 

are deposits of various size, shape, consistency, refractive index, and motility within the eye’s vitreous humour, which is normally transparent.

Visual snow syndrome is often connected to Tinnitus. Tinnitus is the hearing of sound when no external sound is present. While often described as a ringing, it may also sound like a clicking, hiss or roaring. Rarely, unclear voices or music are heard. The sound may be soft or loud, low pitched or high pitched and appear to be coming from one ear or both. 

Some say that Visual Snow and Tinnutis are connected to the ability to see or hear energy and auras.

Source.