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Why can I see out of my eyeglasses better when I tilt my head back?

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I have a new pair of glasses that I like just fine. Even though the prescription is a little stronger in one eye than that of my previous pair, I've noticed that I can actually see some things better if I tilt my head back and look through my glasses at a slight angle or through the bottom of the lens. What gives? Is this an issue with pupil distance, lens curvature, or something else? I don't have astigmatism (that I know of).

Here are the details:

-I'm nearsighted (-1.50 L, -2.50 R) and can see ~20/20 with corrective lenses.
-If there's something really far away that I can't quite read, I can tilt my head back and look through the bottom part of my lens to focus better. I've been able to do this with both my old pair and my new pair of glasses.
-I ordered the new glasses online from a company I've used for years.
-The new glasses have slightly larger lenses than the previous pair.

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