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They aren't round. The lens of the eye focuses light on the back of the eye. The focal point is pretty precise. If the eye, through age, injury, or genetics, forms slightly off, it makes it difficult for the light to be properly focused on the back. Glasses adjust the light so that the eye's lens causes it to happen properly. The lens can also be mis-shaped. The number of diopters off being round the eye is is a measure of how bad the eyes are. And the lens can cause astigmatism, which is a challenge for the focus.

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Q: What is wrong with peoples eyes if they have to wear glasses?
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