When wearing the monocle, everything is seen as dark as night. People seem to have a blue glow around them with lines of light coming off of them. Each line is a solid color, though there are many colors for the many lines. Seems to be able to view people through solid walls, though not as well. Sometimes the lines connect to people or objects, otherwise they slowly fade out.
With help from Marco, El Cid connects the odd lines with the Fate Witches of Vodacce and believes the lines are strands of fate.