Speaking of eyes, Veritasium's occasional collaborator Dianna Cowern (Physics Girl) is doing much better after complications from long covid left her bedridden for two years. It's good to see her up and at 'em.

Her latest video, showing her out of bed and going for short walks, is here: https://youtu.be/vqeIeIcDHD0?si=WoxpqZOuRTWD2XYd