Ooh, that's gotta suck big time! I went to bunnings and bought a flexible shaft thing with little claws that grab stuff, and have found they work great for that sort of dilemma.
If that doesn't work, try a thin strip of flexible plastic, put it down the gap before the spot where your glasses went and try and lever them back up again. Caution is required in case you hit anything else down there, but you can usually feel any resistance.
Hope this helps.
2011 multi van comfortline in night blue metallic, 2011 Jeep Grand Cherokee CRD in Mineral Grey
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