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Keratopigmentation is not to be confused with scleral tattooing, which involves tattooing the white part of the eye and carries a risk for infection and vision loss.

"Given the common occurrence of scleral pathologies, such as DSM and staphylomas in eyes with myopia, recognizing fiber patterns could provide important insights that may be relevant to developing targeted therapies to address scleral abnormalities early and mitigate potential damage to the overlying neural tissue," remarks senior author Dr. Masahiro Yamanari.

The researchers also looked at tiny bones called the scleral ring that encircle the pupil of the eye.

Shuvuuia had a wide scleral ring, indicating an extra-large pupil size that made its eye a specialized light-capture device.

Shuvuuia had a very wide scleral ring, indicating an extra-large pupil size that made its eye a specialized light-capture device.