If the optical center is closer to the pupil, the optical center will be slightly larger. Excessive cheap eyeglasses near me angle and excessive tilt angle. (It's not bad, it should be done in moderation)

Bringing a more obvious prism effect is certainly uncomfortable. (Not only that, mirror angle, tilt angle, and lens distance can all have a subtle impact on luminosity, including spherical mirrors, cylindrical mirrors, and prisms)

Why do they still design like that? They don't lack knowledge of optics, they have no choice but to compromise. High nose bridge and deep eye sockets. If we don't do this, the distance between the lenses is too large. So you see, it's still that sentence. Frame discount prescription glasses are full of compromises. (No matter how much money is spent, it cannot be completely avoided)

Why are retro frames particularly popular in recent years? Because it looks good, why are things that look good eliminated? Do we need to retro them? Because it's not easy to use!

At the beginning, the lenses were manually ground to be round, and the craftsman made a discount prescription glasses frame to protect them. Grinding glass into rectangles was a troublesome process at the time, and it also came with risks (even today, if the requirements are high enough, the success rate of processing lenses is not 100%).

With the improvement of technology, it is no longer difficult to process flat lenses, and these round lenses are marginalized! Because there are a lot of shortcomings.

It is very difficult to maintain the accuracy of the astigmatism axis on a round mirror frame, and it may deviate from the axis. If the circle is relatively high, the human ability to adapt to horizontal aberrations is good, but the ability to adapt to vertical aberrations is poor. More time is needed to adapt.