Optic Nerve Damage

[Ktbridge]

Hi ,
I have a question about an optic nerve damage in newborns , does anyone has any knowledge how and why does it happen? I know a case that was born with one eye seeing well and the other one has an optic nerve damage and is practically blind in one eye. Can a pregnancy cause it and why? What can one person do to protect an nourish their eyes from degenerating and I know Peat mentioned eating well coked mushrooms against cataract .
Thank you!