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And retinitis, which can cause temporary or permanent vision loss during infection, can also appear years after the measles infection.

He told the i newspaper in 2023 that he had lost his sight completely by the age of 22, from a hereditary condition called retinitis pigmentosa, which his grandmother and mother also had.

"We already knew that certain mutations in these subunits are linked to the eye disease retinitis pigmentosa," says Dr. Cristian Prieto-Garcia from the Institute of Biochemistry II, the first author of the study.

Many ocular diseases cause abnormalities in a person's ERG signals, including glaucoma, retinitis pigmentosa, and diabetic retinopathy.

He stays up on it despite deteriorating eyesight from retinitis pigmentosa by listening to lots of television news — and conversing with a lifetime of political friends.