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Optic Membranes
From Warhammer 40k - Lexicanum
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