The details of hyperopia and astigmatism are as follows: 1. Farsightedness: In the relaxed state of regulation, parallel light rays are focused behind the retina after passing through the refractive system of the eye, and this refractive state is called farsightedness. The far point of the hyperopic eye is in the virtual focus behind the eye. According to this regulation state, it can be divided into dominant hyperopia, recessive hyperopia, total hyperopia, absolute hyperopia, and random hyperopia. Hyperopia can easily form refractive amblyopia, as well as internal strabismus, which is usually corrected with a positive lens.2. Astigmatism: Due to the different refractive power of the eye on different meridians, parallel light rays cannot form a focus after passing through the refractive system of the eye, and this refractive state is called astigmatism. That is, parallel light through the regular astigmatism, the eye will form two focal lines and a minimum diffuse spot, according to the mutual position of the two main meridians, can be divided into regular astigmatism and irregular astigmatism, regular astigmatism is also divided into cis-ruled astigmatism, retro-ruled astigmatism and oblique axis astigmatism.