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That is what's called a Cataract, it's the layer of PVA between the tube and the safety glass deteriorating.
It can be repaired but it can be tricky, that one is so bad I suspect it will be one of the easier ones.
Some people use a heat gun on the face of the tube to loosen the bond between the PVA and the glass, that can be hazardous if you heat it unevenly because the tube can implode and spray large chunks of glass all over the place with enough force to kill you.
Another way is to soak the face of the tube in water, sometimes this process takes months to work sometimes a few days.
There's also the Hot Wire method, a small gauge steel Guitar string is heated electrically and used to slice the PVA off.
I'm sure you'll hear from a lot of people on their preferred method.
Last edited by Eric H; 12-29-2011 at 08:06 PM.
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