The weather is hot, what effect will the air distortion have?

The hot air distortion in the weather is the refraction effect of light. When the weather is very hot, because the surface temperature is very high, the air in contact with the surface is also heated, so the density between high-temperature air and low-temperature air is different, and light will be refracted when it is emitted from a medium with sparse light to a medium with dense light. Because the density of the air is changing gradually, it seems that the light is distorted.