Reflection takes place even in a not silvered glass.
I think the reflection takes place when the eye-power increases due to the less power in the glass.
Any person who has an increase in power but wearing his old spectacles.
Let him wear his old spectacles. And in some angles where he/she could get enough light for him/her they could see their own eyes reflecting in their spectacles.
As we could see the other objects when we get enough light, the same principle is observed here. We could see the same reflection because:
· We get enough light
· As the eye-power increases the spectacles
become a normal object.