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Why is there a bulge in the middle of the phone screen with the newly equipped glasses while looking at the phone?

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Why is there a bulge in the middle of the phone screen with the newly equipped glasses while looking at the phone?


1. If you wear aspherical lenses before, match the new glasses with spherical lenses

Due to the spherical aberration of the glass, the object will be deformed when it is put on the glass. When you look at the object through a convex lens with larger curvature, you will feel that the line is "concave"; when you look at the object through a concave lens, you will feel that the line is "convex" "This is due to negative deformation and orthodontic deformation. For patients with aspheric lenses, this situation may be relieved, but the aspheric lens has a low edge degree, and vision in the peripheral, lower, and nearby areas may not be sufficient.

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2. There may be a problem with the parameters of the glasses

For example, the deviation of pupil distance and pupil height can also produce this phenomenon. Pupil distance is one of the most important parameters in the lens matching process. Correction, astigmatism axial position and pupil distance. If the pupil distance is different, it is like in front of the eyes. Add a prism to make the eyes squint. Over time, the eyes may have vision problems, so the pupil distance is very important. It may also be the distance between the lens and the eyes. Generally speaking, the distance between the eyes of the test bench is 12 mm, so the glasses should also be 12 mm, otherwise, it may be unclear or uncomfortable, so it should be adjusted.

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3. Caused by dispersion phenomenon

Some people are very sensitive to chromatic dispersion, so it is uncomfortable to wear ultra-thin lenses with high refractive index and low dispersion coefficient. For these people, it is best to wear low refractive index lenses with low refractive index and low dispersion. This kind of lens It is usually thick and not very beautiful, but it has high definition, good comfort and good health.


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