https://www.khanacademy.org/humanities/ap-art-history/early-europe-and-colonial-americas/renaissance-art-europe-ap/a/leonardo-last-supper
https://www.hopkinsmedicine.org/health/conditions-and-diseases/strabismus#:~:text=Strabismus%20%E2%80%94%20also%20known%20as%20hypertropia,the%20other%20eye%20remains%20focused.
https://www.researchgate.net/publication/328441117_Evidence_That_Leonardo_da_Vinci_Had_Strabismus
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