Well, hopefully not my biology class :)
Seriously,our eyes are a portal to our emotions and feelings. When we are happy our eyes seem to sparkle, when we smile we smile not only with our mouth but our eyes light up too. The glaze you are talking about usually occurs when mentally you have "checked out" of a conversation. Your mind has wondered into another place, thus the vacant look in your eyes.
The only other scientific explanation I could find on this related to blood supply but I don't think that really applies to the context of your question.
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