That is why we have set a standard for the children's glasses wearer, a standard of 'perfect glasses'. Close-range visual three linkages: adjustment, convergence, and pupil reduction.

Has the eye condition changed, have the glasses changed? No, Adjustment is the correct correction of refractive error in a relaxed state at a distance, and it is the responsibility of the eye itself, not the childrens glasses lenses.

Shrinking pupils is a natural function of the eyeball, and the lenses do not affect it. Gathering function, the eyeball rotates inward, but the lens does not move. The optical center of the lens no longer corresponds to the pupil.

The eyes change at any time, but the children's glasses lenses remain unchanged, so there will be no "perfect glasses". The reason why most people cannot feel the difference is because the wearer's fusion image reserve is large enough. The additional fusion image burden, when combined with the inherent inclination and properties of the eye position, constitutes the final fusion image burden.

For example, in the case of myopia and within the normal range of indicators, the use of an inward turning set is necessary for correct gaze in cases of implicit inclination; The close use of pupil distance causes the prism effect on the external division of the image; External segmentation of the image leads to external segmentation of the eyeball, which is necessary for normal gaze; Since external division of the eyeball is required, there is no need to use the internal turning set again; Without using the fusion image collection, the burden on the eyes is reduced, and fatigue will not occur.

The current fixed pupillary distance glasses are suitable for people with myopia, orthostatic or oblique vision, and normal fusion function. Tell the wearer: Discomfort may be due to eye position and fusion imaging issues. If comfortable glasses cannot always be matched, then check eye position and fusion imaging.