Even though there is no light at the bottom of the ocean but still marine animals are adapted to not being able to see and even if they had eyes, they would not be able to see.
Many sea creatures that occupy the lower benthic zones of the ocean are sightless.
Animals that live on the sea floor are called benthos and most of these animals lack backbone and are hence called invertebrates. Benthic invertebrates are sea anemones, sponges, corals, sea stars, sea urchins, worms, crabs and others.
Because of the depths, benthic zone is characterized by low sunlight and low temperatures and this attributes to little life and biodiversity.
To know more about benthonic zones, refer
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