this post was submitted on 29 Dec 2025
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That's a Scleral Ring and helps to keep the shape of the eye in fish, many reptiles, and birds. Fish don't have round eyes (they're shaped more like M&Ms or chocolate chips), and the ring helps support the shape when swimming. Most rings are just cartilage, but fast swimmers often have bony rings.
Thank you, I had no idea that reptiles and birds have eyeball rings, too.