Hyperopia is usually caused by short eye axis, abnormal corneal curvature, and weakened refractive power of the lens. 1. Short eye axis: The patient’s eye axis is too short due to congenital underdevelopment. Parallel rays of light enter the eye and reach the retina to form a blurred image before focusing, resulting in the symptoms of hyperopia. 2. Abnormal corneal curvature: When the curvature of the refractive surface of the patient’s eyeball is small, the refractive power will be weakened, resulting in the symptoms of hyperopia due to abnormal corneal curvature. 3. Refractive index of the refractive interstitium is lower than normal: when the refractive index of the patient is lower than normal, it will cause hyperopia, which is called index hyperopia. For example, after cataract extraction, the refractive power decreases dramatically and high hyperopia will occur. It is recommended that patients should go to regular hospitals as early as possible when they have symptoms such as visual fatigue or inward slanting, get corrective lenses under doctor’s guidance, and undergo a yearly retest.