What does flat light mean?

Flat light refers to normal eyes without myopia, hyperopia and astigmatism.

Related information:

Light clamping is divided into left and right light clamping and up and down light clamping. As the name implies, two lamps are mainly used to illuminate at a certain angle up and down or left and right respectively. You can shoot flat and beautiful light effects, and you can also shoot stereoscopic light with a certain brightness. The effect is the light on both sides of the main body.

The gradual change from the edge to the center is beneficial to the three-dimensional effect, but it will change the texture and color of the skin. Clip lighting is a widely used lighting method in portrait photography, which is convenient, fast, changeable and easy to control.

There are many ways to clip light, but the basic changes are the same. Many combinations of light have evolved on the basis of clipping light, such as butterfly light.

Astigmatism is an abnormal refractive state of the eye, which is related to the curvature of the cornea. The human eye is not perfect. Some people's corneas are curved at a certain angle, while others are flat.

Astigmatism is caused by the uneven thickness or curvature of the cornea, which makes the refractive index of each meridian of the cornea inconsistent, so that the light passing through these meridians cannot converge on the same focus. In this way, the light can not be accurately focused on the retina to form a clear object image, which is called astigmatism.

Astigmatism can be divided into regular astigmatism and irregular astigmatism, the former can be corrected by cylindrical lens frame glasses, while the other needs to be corrected by corneal contact lens.