Eye Diagram

What Does Eye Diagram Mean?

An eye diagram is an indicator of quality in a serial bit stream. The display (which has symmetrical patterns shaped similarly to eyes, hence the name) represents the integrity and consistency of data streams by visualizing the transitions between 0 and 1 values and comparing those transitions among the others in their stream.


An eye diagram is also known as an eye pattern.

Techopedia Explains Eye Diagram

Eye diagrams are displayed using oscilloscopes, which overlay segments of data streams to produce graphic representations that look similar to open eyes. If the edges of these shapes appear solid and consistent (or “stable”) then the signal is good and has integrity. A bad signal, conversely, shows inconsistent lines and less-defined shapes.

As data streams increase in rate, volume and complexity, the demand for consistency and integrity makes eye patterns highly useful for engineers.


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Margaret Rouse

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.