Actually, your daughter with 20/50 vision is considered to have visual impairment because she can see an object clearly at 20 feet away that a person with normal vision can see clearly at 50 feet away. So she need to wear eyeglasses. However, with the type of your daughter's vision and no symptoms, you will not harm your eyes by not wearing glasses. But, your daughter are missing out on a lot by being blurry! It is a common misconception that wearing eyeglasses makes eyes worse. There is no permanent vision change caused by wearing glasses. Your brain does lose its "blur adaptation" temporarily, which is how you compensate for seeing badly, but it comes back if you go without glasses for a while. So you can decide whether to wear eyeglasses or to be blurry. Hope this helpful.