Comment by teruakohatu

Crabs predate cuttlefish in the fossil record by a significant amount of time (~50 million years), but both have had a good 100 million years to battle it out and crabs are still blinded by the camo. Cuttlefish maybe have not exerted enough evolutionary pressure on crabs to make them adapt, or there are crabs that have adapted and we just don't know which species or have not discovered them yet.