The lens shall be adjusted from front to back. When the external long angles of both legs are consistent and symmetrical, the force on both sides shall be uniform to make the cheapest eyeglasses online lens flat.

If the right leg angle is too large, the right lens will be close to the eye, while if the angle is too small, the right lens will be far away from the eye. After adjusting to the symmetrical angle of the legs, the cheapest eyeglasses online naturally won't be in front of each other anymore.

Nearsighted lenses are too close to the eye, increasing effective power, while farsightedness is the opposite. Nearsighted lenses have a lower effective power when moved away from the eyes, while farsightedness has the opposite effect.

So this pair of glasses is not the true prescription, especially for people with high myopia or hyperopia, where the prescription changes significantly.

The glasses are too loose to wear, they slide down as soon as you lower your head, the glasses are worn high and low, crooked and deformed, and so on. How to adjust the cheapest eyeglasses online when they become deformed or loose? The main inspection is to check the wear level of the eyeglass frame and to see if there are any signs of open welding at the welding points.

Wearing glasses for a long time (especially frameless perforated frames) may cause a few screws to loosen. In this case, we need to use a specialized screwdriver to lock the screws, but they should not be too tight. They can be loosened appropriately, otherwise, it will cause inconvenience during use.

Mainly adjust the curvature of the mirror surface, that is, the angle between the plane lines of two lenses. The external angle mainly refers to the angle between the metal frame, mirror legs, and mirror surface.