Causes Of Dizziness When Wearing Sunglasses

The prism degree is the distance from the lens to the object, 100 times the lens power of the image point on the object, that is, the ratio of the deviation distance of the imaging point to the distance from the object to the lens is expressed in cm/m, including two indicators: the vertical meridian of the paired lenses The difference does not exceed 0.25 cm/m, and the difference between the horizontal meridians does not exceed 0.75 cm/m: If any index of the two lenses of a pair of glasses exceeds this standard, it will make people feel that the eyes are swollen.

Sphericity exceeded
Sphericity is the average value of the optical power of the two main meridians of the lens︱D1+D2︱÷2, the standard is within ±0.12mm, if it exceeds this standard, it will make people feel dizzy.

Excessive astigmatism
Astigmatism is the absolute value difference between the two main meridians of the lens︱D1-D2︱, the standard should be greater than 0.12mm, if it exceeds this standard, it will make people feel dizzy. Because the above three indicators of the lens below 6 curves (referred to as 6C) are relatively stable and not easy to exceed the standard, the difficulty of optical processing will increase exponentially if the lens exceeds 6C, and the curvature of the lens is too large.