So how much trouble has lens aberration caused? Firstly, it's about the thickness. We all know that nearsighted eyeglasses online cheap lenses have the thinnest edges machined according to the physical center of the frame.

But to reduce aberrations, one may become accustomed to looking at things with slanted eyes. Have you noticed that wearing glasses with frames doesn't make eye movement as flexible as wearing contact lenses? Is the playing experience more obvious? Have you found the reason?

Mirror eye distance, the closer the optical center is to the pupil, the larger the optical center. Excessive mirror angle and excessive tilt angle. It's not bad, it needs to be moderate.

Bringing about a more pronounced prism effect is certainly uncomfortable. Why do they still design like that? Because of the high nose bridge and deep eye sockets. If we don't do this, the distance between the eyes is too large.

So you see, it's still the same sentence. Frame eyeglasses online cheap are full of compromises. Why are vintage frames so popular in recent years? Why are beautiful things eliminated because they look good? Do we need to go retro? Because it's not easy to use!

At the beginning, the lenses were manually ground to be perfectly round, and the craftsman made a frame to protect them. Grinding glass into a rectangle was a troublesome process at that time.

With the improvement of technology, when it is no longer difficult to process flat lenses, these perfectly round lenses are marginalized!

So don't look down on flat little boxes and ellipses eyeglasses online cheap. They are a form of progress. The edges and corners make the processing unnecessary and tight, ensuring that the lens does not rotate off-axis.