Haze is also called turbidity. It can measure the degree of unclearness or turbidity of transparent or translucent materials. It is an indicator of scattering. The generation of haze is the cloudy or turbid appearance caused by light scattering from the internal or external surface of the material. The definition of haze is: the percentage of the ratio of the luminous flux scattered by the material to the luminous flux through the material.

  Both light transmittance and haze are important indicators to measure the transparency of materials. The relationship between the two is as follows: Generally speaking, the relationship between transmittance and haze is inversely proportional, that is, materials with high transmittance have low haze; vice versa. But the relationship between the two is not always the case, and sometimes there are opposite results. For example, ground glass has higher light transmittance, but its haze is also relatively large. Therefore, transmittance and haze are two optical indicators that are mutually opposed and interrelated. The following is a schematic diagram of the different effects of light transmittance and haze: