Yes, it is possible to get glassy eyes from allergies. Actually allergies, irritation and infections of eyes are on the list of causes to glassy eyes. Dryness of eye can make eyes lifeless, and glassy. Dry eyes are symptoms of eye allergies too. Besides conjunctivitis which is called pink eye too, is a main cause of glassy eyes, and at the same time, allergies can lead to conjunctivitis. If your glassy eyes are caused by allergies, it is not big serious problem for you to worry about. Allergic conjunctivitis could get well soon if you are away from allergen. You even don’t need any other treatment, it can heal up very soon. So does the glassy eyes triggered by allergies. If you still worry about it, or you think it is serious, you can go to doctor for help or try some medication such as topical or systemic antihistemamines which can be immediately effective, if you are quite sure that you have allergies. Hope you can get well soon.