fisheye

Etymology
From.

Noun

 * 1) An unfriendly or suspicious glance.
 * 2) An undesirable effect in paint, particularly automotive finishes, normally caused by oil or other contaminants on the painted surface.
 * 3) An undesirable dull appearance in the table of a diamond that has been cut too shallow.

Verb

 * 1)  To glance unfriendlily or suspiciously at.