Farsightedness is a common disorder in children. Many people think that people with farsightedness just see clearly at a distance and not clearly up close. This is usually true for adults, especially those over the age of 40. This is because with age, the adjustment power decreases, and when looking close to read, it requires 3 D’s of adjustment. When one’s own adjustment power cannot reach this adjustment need, looking close will be blurred, and this phenomenon is called presbyopia, which is usually referred to as presbyopia. However, for children, this is not the case. After birth, the eye has physiological hyperopia and very strong regulation, and this physiological hyperopia can be considered as a “starting point” for eye development. This is not to say that we all need glasses at birth, but that there is a physiological need for accommodation. Under normal conditions, infants and children can achieve 10-12 diopters of accommodation, which indicates that they can tolerate more hyperopia than adults. The human ability to focus regulation gradually decreases over time, and generally in the 40s, the regulation power cannot meet the regulation needs, that is, the need for reading glasses begins. However, the age at which one wears glasses varies greatly from person to person and depends on the “starting point” of each individual’s development. When do I need to correct my farsightedness? Physiological farsightedness does not require glasses, but if farsightedness causes vision loss, headaches, visual fatigue, or internal strabismus, it is time to correct it. For infants and children who do not know how to check their visual acuity, the need for prescription glasses requires comprehensive consideration, including: the degree of hyperopia after dilated eye examinations; whether there is a family history of hyperopia and internal strabismus; whether there is internal strabismus; and the visual behavior status of the child. These factors should be taken into account before making a judgment. In general, children can overcome about 4D diopters of hyperopia without glasses, and if they exceed this limit, they usually become symptomatic. Symptoms occur when we need to use half of the accommodation reserve (10-12D of accommodation). So if a child has 4D farsightedness, when looking at a distance, it is possible to apply the accommodation power to overcome it, but when looking at a near place, together with the increased accommodation need of 3D when looking at a near place, the total accommodation need is +7D, and the visual fatigue appears accordingly. In adults over 40 years old, the regulation reserve is often reduced to 4-5D, and half of the regulation reserve is 2-2.5D, which cannot well meet the regulation need of 3D when looking at near, so the symptoms easily appear when looking at near, the earliest is often blurred when looking at near, headache, or eye fatigue. This is the same as farsighted children’s visual fatigue symptoms, farsighted glasses can be very good to relieve such symptoms. We often find in life that the better the vision when you are young, the earlier the blurring of the eyes, for the same reason. People who have good naked eye vision when they are young tend to be more physiologically farsighted when they are young, i.e., the starting point of development is biased toward hyperopia, and farsightedness gradually fades as they develop when they are young (human beings will reduce farsightedness by 3 Ds from the age of 3 to 10), but it may be slightly more residual than the average person, relying on strong regulation to overcome it and see distant places extremely clearly. As we age, the magnitude of accommodation decreases and cannot meet the already slightly higher accommodation needs, and symptoms of presbyopia appear earlier.