Optic Membranes var addthis_config = {"data_track_addressbar":true};

!	Previous Edition Warning: This article discusses a topic from a previous edition of Warhammer 40,000. Its Canonicity is in question but was once considered canon.

Tyranids Portal

Optic Membranes are a Tyranid Biomorph. The creature's eyes have been modified with an extra membrane which can cover the eyes momentarily, allowing it to avoid being blinded by sudden flashes of light.^[1]

Sources

• 1: Codex: Tyranids (2nd Edition), pg. 67