The glasses are not suitable, is it because the stress on my glasses is too high. Unless it causes deformation in the central area of the lens, it has no discountglasses effect.

Looking at the stress on the lens, a slightly higher or lower peripheral stress has no effect. For example, the stress in this situation has no impact.

And there are also some situations where it is necessary to install it tighter. For example, if the prescription is relatively high, it usually needs to be installed tightly. High-prescription lenses are thicker and heavier, so safety considerations discountglasses must be taken seriously. There is nothing more dangerous than losing a lens.

However, there are also situations where it cannot be too tight, and the sheet frame cannot be too tight. The sheet frame may experience thermal expansion and contraction. If installed too tightly, it can easily cause the lens to bulge and deform over time, affecting vision and comfort.

How to self-check lens stress? Find a tube lamp and look at the reflection on the lens of the tube lamp. Move the lens from top to bottom until the shape of the tube lamp is uniform.

If the tube lamp in the center area of the lens does not deform, it is not a problem, and if there is slight deformation at the edge position, it is not a problem. And now processing is done by machines, and there are rarely situations where it is too tight or too loose.

People who wear glasses for a long time may experience deformation of the nose bridge and depression of the corpora cavernosa at the nasal wing due to prolonged compression. Especially with high myopia, I took off my glasses and had two pits on my nose bridge. So when we choose discountglasses, we try to be as light as possible.