Traits

Sightless eyes with a pale pupil.
Cave leeches are inherently blind, though some have developed eyes as a mimic target. On occasion these eyes can detect changes in light and dark - but without evolved optic nerves they're still functionally useless.

Note: Cave leeches cannot have any other eye type - but these can take the shape of all other eyes. The important part for them is that they are blind, even see-all shaped false eyes!