Could Jon snow end up blind ?

Oh no! Did you have to get this in my head? I haven't heard that song for ages…
It's terrible "poetry", sorry for inflicting this on you, but I almost wonder if that could be part of the inspiration for Jon Snow, the depressed hero. Spoiler: the Night King is GRRM's version of cold turkey. I wouldn't even be surprised.

What you get and what you see
Things that don't come easily
Feeling happy in my vein
Icicles within my brain

Something blowing in my head
Winter's ice, it soon will spread
Death would freeze my very soul
Makes me happy, makes me cold

My eyes are blind but I can see
The snowflakes glisten on the tree
The sun no longer sets me free
I feel the snowflakes freezing me

Let the winter sun shine on
Let me feel the frost of dawn
Fill my dreams with flakes of snow
Soon I'll feel the chilling glow
…

Crystal world with winter flowers
Turns my day to frozen hours
Lying snowblind in the sun
Will my ice age ever come?

Snowblind - Black Sabbath, 1972



thats actually very very sad poem or song its the band black sabbath ? Don't know much about them except that Ozzie Osborne was part of it , so you're saying there is a chance will happen.

The song is about coming down from a cocaine rush, which is one of the few things the band were doing at the time. By the end of the 70s, Ozzy had become too much of a wreck to continue. The blindness is not literal.
As to it happening, it would be fun. GRRM is known to be a big Grateful Dead fan, so his taking inspiration from a Black Sabbath song is not impossible. Can you imagine an Ozzy cameo in Season 8?