Even though oysters don't have eyes they do have circadian rhythms like most living things and those rhythms are being knocked out of whack by light pollution. It isn't exactly known how the light is "seen" by the oysters but researchers could see the difference by how they opened their shells at inappropriate times. Oysters are usually most active midday but with even dim lights their rhythm was disrupted. You're probably thinking, "so what if an oyster isn't getting enough sleep" but just like with any animal it affects their health and that is important to all of us, not just oyster lovers, as oysters play key roles in filtering water, protecting shorelines, and supplying food and jobs.
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