It is best to highlight the pupil and draw the specific position of the pupil on the discount eyeglasses online frame. If it is possible to provide the corresponding data for the forward tilt angle and surface curvature, it would be better.

If it is not possible to measure, it is better not to provide it, so as not to provide incorrect data and have the opposite effect.

To measure the forward tilt angle, it is necessary to wear the discount eyeglasses online frame and stand comfortably to measure. With the above data, it can be guaranteed that this mirror will not have any problems with farsightedness. If there is strabismus, corresponding visual training should be done.

But this only solves the problem of looking far, and there is still visual fatigue when looking close. How to solve the problem of looking close.

The cause of visual fatigue in recent times - prism, what is prism! Myopia lenses are composed of prisms with an outward facing base, while hyperopia lenses are composed of prisms with an inward facing base.

Then there is a problem, a lens will have prisms at positions other than the optical center. The greater the degree of the lens, the larger the prism produced for every 1mm movement.

When the difference in power between the left and right eyeglass lenses is relatively large, the resulting prism is different, and the eyes need different abilities to overcome the prism. The ability to converge and adjust refractive errors is originally weak.

When selecting a discount eyeglasses online frame and tapping the pupil, it is important to find the correct position of the pupil and avoid creating a prism as much as possible. However, when looking at a distance, accurate data can prevent the formation of a prism.