Under normal circumstances, cheapest eyeglasses, overcorrection, and under-correction are both incorrect. Only when the customer cannot accept "foot correction" during the optometry process will appropriate under-correction be considered, and overcorrection is not allowed under any circumstances.

Lowering one's glasses prescription is harmful to eye health and not beneficial. Simply put, sufficient optometry prescription of discountglasses is necessary to ensure clear vision and prevent further deterioration of vision.

The astigmatism axis and degree of the new glasses are different from those of the old glasses. Now, adjust the astigmatism to the most suitable state for your eyes. However, as the old glasses have been used for a long time and your eyes have adapted to the incorrect astigmatism state of the old glasses, you may experience discomfort symptoms and need to adapt for some time.

When fitting glasses, it is usually necessary to carefully refer to the parameters of the old glasses. If the old glasses have been used for a long time, customers will adapt to the brightness and axial direction of the old glasses. The axial brightness of newly fitted discount eyeglasses online should be as close to the parameters of the old glasses as possible.

The lens has been replaced from the previous spherical to the current nonspherical. Spherical lenses have higher edge power than center power, resulting in significant visual distortion, while nonspherical lenses have similar edge power and center power, resulting in a more realistic visual experience.

So after replacement, you will feel that the visual clarity in the central area of the lens is slightly worse than that of the old glasses, which is a normal phenomenon and needs to be adapted to for some time. The dispersion and aberration of nonspherical lenses are much better than those of spherical lenses.