Prism degree of sunglasses

The prism degree of sunglasses should be 0.00 Δ, If the lens has a prismatic degree, it will cause the focus of the visual object to shift. If it exceeds the allowable range of the standard, it may cause the visual object of both eyes to not be aligned, or create a sense of imbalance between high and low, exacerbating the disorderly regulation of the wearer's eye muscles and optic nerve. In severe cases, it can also lead to nerve regulation disorders or the occurrence of strabismus. According to Table 4 of GB10810.1, the prism tolerance is 0.25 Δ.