I can't believe my eyes!

Sorry, that wasn't correct.
Glasses, which are thicker in the middle compared to its edges, are not made for people with difficulties in seeing far away objects. Therefore the glasses cannot belong to Michael's grandma.

But hey, no reason to give up! Even if you haven't answered the question correctly yet, the hints and clues can help you on. So, why don't you take a look at some more clues and try again to find the correct answer.