I have tried reading about development of vitreous humor but it is all very confusing. When does it first developed ? Does it renew itself ? Please provide reliable sources..
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Look at this scheme -
As I stated before, vitreous is 99% water and is not an organ itself, thus the "replacement of vitreous" is actually = 99% water re-production and the only organ inside the eye which can perform this - ciliary body.
Consequently, if the vitreous was removed and replaced by gas or saline it will be replaced by aqueous which produced by ciliary body - this process takes 8 weeks to completely replace foreign substance as a gas by aqueous.
