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day and night vision...

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bacillus:
Vision strength could be dependent on an optic material...

remember, in real life, the only nocturnal benefit is to avoid certain diurnal predators, or to coincide with the activity period of nocturnal prey. Poor eyesight just means that a species doesn't rely much on vision, so the degeneration of 'eye genes' has a relatively small effect on the fitness of an individual.

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