An optic-nerve tumor is a growth that forms right on or around the cable sending pictures from eye to brain. Because the space is tight, even a small bump can blur or blot out sight before any pain shows up. The first warning is slow vision fade in one eye. Colors look washed-out, like someone turned down the saturation, and reading fine print takes longer than it used to. Side chunks of sight disappear next. You miss cars on the left when pulling out, or the top shelf seems to vanish unless you tilt your head. Straight lines may start... Learn more