Several system performance measures can be derived by analyzing the display. If the signals are too long, too short, poorly synchronized with the system clock, too high, too low, too noisy, too slow to change, or have too much undershoot or overshoot, this can be observed from the eye diagram. An open eye pattern corresponds to minimal signal distortion. Distortion of the signal waveform due to intersymbol interference and noise appears as closure of the eye pattern.
|Eye-diagram feature||What it measures|
|Eye opening (height, peak to peak)||Additive noise in the signal|
|Eye overshoot/undershoot||Peak distortion|
|Eye width||Timing synchronization & jitter effects|