Do eyeglasses really cure nearsightedness?

Yes and No: Eyeglasses can correct or treat nearsightedness but they do not "cure" the condition. It depends on how you define "cure." if the definition is best uncorrected vision than only laser refractive surgery or refractive lens exchange can be considered. The glasses simply help to refocus the light. They do not make your nearsightedness worse or better. But you will like your vision better!