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Pretty much what the title states.

Some cells/structures in the human body undergo rejuvenation periodically by flushing away older cells and growth of new ones. E.g Skin, Blood

Does this (for want of a better word) 'rejuvenation' apply to Rods/Cones within the eye too? If so, how are the old cells flushed out - or do the old cells become part of the local humour?

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The answer can be found in the excellent lecture from 1983 The Life History of Retinal Cells which also has gorgeous microscope fotos. The renewal time of rod outer membrane proteins is less than two weeks. Cells stay indefinitely, as I understand, but are periodically rebuilt in a logistical nightmare/wonder.

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