Many believe it was Roper in the third fight to be the final nail. Greb did not go to the doctor after Norfolk but the day after the third Roper fight he was seen with eye patches. Greb was already thought to have a retinal tear in his right eye via Norfolk and its believed that Roper thumbed him repeatedly causing a complete detachment. In those days they did not differentiate between a tear and detachment so the doctor entered Norfolk as the reason for his blindness at the time of his death.
Either way he fought blind in one eye for the last couple of years and was thumbed by others like Walker etc until the end.
I often think of Langford when this topic arises. He fought blind in both eyes at the end of his career.
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