When a person's eye accommodation ability is weakened by age, it is necessary to correct vision at a distance and a distance respectively. At this time, it is often inconvenient to wear two pairs of glasses respectively. So two lenses with different refractive power are produced and become two regions. This kind of lens is called bifocal glasses or bifocal glasses.

But not everyone is suitable to wear these glasses. People in the following situations are not suitable for wearing this kind of reading glasses, depending on whether you are in one of the following situations:

The astigmatism of 1 is too high, the binocular images are difficult to fuse, and the near-field prism difference is too large, so it is not suitable for wearing.

It is not suitable for patients with cerebral congestion or cerebral infarction, because such people will feel carsick after wearing it and it is difficult to adapt.

Librarians, pilots and other special groups need to look close from above or far from below when working, which is also not suitable.

In addition, everyone should pay attention not to buy this kind of reading glasses online when buying:

This kind of reading glasses needs optometry and fitting, and it is impossible to fit them simply by providing two parameters: degree and pupil distance. Because this kind of reading glasses need to be tried on site to test the distance, it is recommended not to buy them blindly online.

In addition, the quality and frame of this kind of reading glasses purchased online cannot be tried on the spot, and the quality and after-sales are difficult to guarantee. If you don't buy it well, the wearer will not only see it clearly, but also aggravate the discomfort.

If you have any questions, please leave a message in the comments section, and I will answer them patiently. [flashing]