The formation of hyperopia can be divided into two main categories, one caused by a decrease in the refractive power of the refractive component of the eye and the other by the relative shortening of the eye axis. An eye in which the focal point of parallel light falls behind the retina after passing through the refractive system of the eye at rest during accommodation is called hyperopia. The refractive system of the eye consists of the cornea, lens, vitreous humor, and atrial aqueous humor. These four intraocular transparent structures have different refractive indices, and the degree of refraction of light rays through these four intraocular structures is different. The two most important refractive components are the cornea (approximately 43 D in refraction) and the lens (approximately 19 D in refraction), so abnormal changes in the cornea and lens can form refractive hyperopia. (2) Axial hyperopia is due to the relative shortening of the eye axis, the refractive power is not significantly different from that of normal eyes, and the focus of light therefore falls behind the retina. People are born with an eye axis of only 16 mm and are hyperopic. As the eye grows older, the eye axis grows to the normal range and becomes orthokeratology, so physiological hyperopia is axial hyperopia. In clinical practice, hyperopia may also appeal to both types of causes. In summary, hyperopia can be formed by refractive hyperopia due to structural abnormalities in the refractive system of the eye, axial hyperopia due to relative shortening of the eye axis, or hyperopia due to the simultaneous presence of both factors.