The most common cause of "crooked" frames is the removal of glasses with one hand, and the frames are very easy to deform when taking off glasses with one hand. If you pull the temples on one side with one hand for a long time, it is easy to have a high and low frame, or the lenses are one front and one behind, that is, "the center is different", and "the frame will also be crooked".
What we need to know is that myopia is caused by a problem with the refractive system of the eye, which causes the eye to overelongate when looking at distant objects, so that light cannot be accurately focused on the retina. As we grow older and our eye habits change, myopia will gradually worsen.
There will be an "optical center" on the lens of glasses, the optical center is the precision on the glasses, and all the sizes and angles on the frame are designed and made to ensure the accuracy of this center. Normally, it is "centered" with the visual system of our eyeball, so any slight distortion on the frame, resulting in a slight deviation of the vision channel, will immediately reflect the wearer's clarity and comfort.
When we look at the outside world through the optometry center, because our vision has been effectively corrected when we pass through the optical center, everything outside can be seen very clearly. If the frame becomes "crooked", wearing such a frame cannot accurately see through the optical eye, and it is easy to change the coordination between the eyeball and the glasses in the long run.
Taking off the lens with one hand can easily cause the screw on one side of the temple to loosen and the two sides to be unbalanced. The temples are easy to bend, which may cause the optical center of the lens to shift, and the eye has to adjust repeatedly in order to adapt to the offset optical center, which will not only produce dizziness, fatigue, and trance. Long-term wearing will also lead to the deviation of the eye's gaze point, which will affect the new glasses in the future, resulting in discomfort such as reduced vision and elevation of the road surface, which will require long-term adaptation.
In everyday life, when taking off your glasses, hold the temples with both hands parallel to the sides of your cheeks. To check that the temples of your glasses are not deformed, you can choose to place your glasses flat on the table, observe if one side is upturned, and then adjust them by bending. For frames that have been slightly deformed and cannot be changed by bending, you can use a hair dryer at home to heat it up and try again.