Glaucoma usually has few or no symptoms. A noticeable difference that individuals may experience is an increased pressure inside the eye, called intraocular pressure (IOP). Once the pressure becomes elevated, there is a greater chance of damage to the optical nerve.
The optical nerve is similar to an electric cable, where many wires are bundled together. If IOP increases, glaucoma can damage the nerve fibers, or “wires,” causing blind spots to appear in your field of vision as each individual wire is affected. Another symptom of glaucoma are these small blind spots; however, it is often that individuals do not notice the blind areas until a majority of the optical nerve has been damaged.