What is the definition or description of: visual disturbances?

Vision interuption: A visual disturbance is simply anything that affects quality and/or quantity of sight. It can be from the eye, brain, etc or a signal of some internal disease process.

Various answers: While the term could mean anything that affects the vision, a "visual disturbance" usually implies an unusual visual phenomenon, such as seeing wavy lines or zig zag flashing lights (visual migraine), seeing brief flashes in the vision (retinal traction), seeing darting sparkles in the vision (entopic phenomenon), floaters, starbursts or halos around lights (cataract), and other things like that.