****Matthew Perry Question (possible spoiler)

VERY small season 7 spoiler.......
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Does anyone know if Chandler's glasses are temporary or what?  Our they now
"part of Chandler?  Or is it just because Matthew Perry lost his contacts?   Or
could it possibly be that Matthew got some type of eye surgurey and can't wear
contacts or put anything in his eyes for a short while?   Does anyone know???
  ~Sara~
"Hey, look at me!  I'm Chandler.  Could I BE wearing more clothes?"
"They don't know that we know they know we know."
"Actually, it's Ms. Chinandlor Bong."
"My Bing-a-ling!"