The Abbe number of a lens is the dispersion coefficient, which is an important indicator for measuring the imaging clarity of the lens and is one of the reference factors for eyeglass online lens selection.

Usually, the Abbe number is inversely proportional to the refractive index, which brings us back to the previous point. High-refractive lenses have an advantage in thickness, but at the same time sacrifice the clarity of the lens. Therefore, it is important to choose the lens that suits oneself. The one that suits oneself is the best, isn't it?!

The purpose of applying film to lenses is to improve their transparency and treat them. Green film is the most widely used film layer. Also, anti-reflective film, anti-UV film, anti-glare film, etc. Different brands and series of lenses have different film layer structures.

How often do cheap eyeglasses near me need to be changed? The suggestion is to have your glasses checked once a year and replace them once a year. After the lens is scratched and worn, it becomes less clear, which can lead to an increase in eye fatigue. Therefore, once a year, even if the degree remains the same and the frame is not replaced, it is best to replace the lens.

Ordinary frames, whether made of sheet or metal, are generally not expensive. Special material frames, such as ultra-light titanium frames, are more expensive than ordinary frames.

Luxury brand frames have better materials and higher brand-added value, making them the most expensive among these frames. Choose titanium frames or ordinary frames, which are cheap and beautiful. Buying several pairs of frames a year to match different clothes is not a burden, and if the economy allows, choosing a better one is also not a problem.