Face curvature is the curvature of the eyeglasses online cheap frame (you can simply understand it as the angle between two lenses), while base curvature is the curvature of the surface of one lens.

In eyeglass processing, when encountering large curved frames, large base curved lenses are generally used. Otherwise, if the curvature of the lens is not enough, the frame will be flattened, resulting in a smaller curvature of the assembled eyeglass frame and loss of its original shape.

At the same time, due to the mismatch between the curvature of the lens and the frame, the lens is easily ejected and dropped during use. One of the characteristics of non-spherical lenses is flatness, and it is best to choose spherical lenses for large base curvature.

At the same degree, the higher the refractive index, the thinner the lens. Myopia lenses are concave lenses with thin edges in the middle. So the larger the frame size, the thicker the edge of the lens.

The greater the difference between the pupillary distance and the geometric center of the frame, the thicker the edge of the lens. So, the closer the sum of the frame sizes is to the pupillary distance, the thinner the edge of the lens.

Polarized sunglasses near me now lenses can effectively reduce glare by only passing light waves in one direction through polarizing films, making them particularly suitable for driving and outdoor activities.

Stained film is a pigment that penetrates the lens and absorbs some of the light passing through the sunglasses near me now lens, thereby reducing the intensity of light and avoiding direct exposure to the eyes, improving visual comfort. Due to its rich color options, it can also serve a good decorative purpose.

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