sadly the eys closing is a sign of rapid going downhill as they say

i dont want to worry you but this happend with most ofmy hamsters
of course mine were just your average hamster you buy
not a special breed

i would say 2 years for a hamster is pretty good age and this is bacicaly
just him in old age now

you may notice he might become less energetic in the next few weeks

athough he might just havean iritated eye
normal this passes within a week
so if worried seek vetenary help they may give you drops or give him a shot
of antibiotics

they tend notto do much with hamsters and treatment ether kills them or wont work

ive had many hamsters in my time and only one of them saw the good old age of 3
the rest shortly after 2 years old
the one that lived the longest actualy had been bred a few times
so had a few litters which is why i think she lived so long

but yeah, hopfully its nothing but i think its just old age kicking in
as this happens as if my magic over night
or sometimes takes months for a condition to develop just depends really

but hopfully all will be ok in your case and he recovers fully

good luck

pugz