Hearing farsightedness, most of them think it means seeing far away clearly and not seeing near clearly, but it is not true. Ordinary emmetropia is an eye that can see far and near. Parallel light enters the eye and focuses on the retina to form a clear image; while in hyperopia, parallel light enters the eye instead of focusing on the retina, but After focusing on the retina, you need to use a convex lens to gather the light to focus on the retina, so that you can see a clear image of the object. In layman's terms, hyperopia actually means looking far and near without being clear.

Why are people farsighted?

The vast majority of presbyopia is due to small eyeballs and short anterior and posterior diameters of the eyes, which is medically called short axis. This small eyeball is not the same as the small eyes we usually say. We usually say that small eyes and big eyes actually refer to the size of the gap between the upper and lower eyelids (called palpebral fissure in medicine). Some people with small eyeballs have small palpebral fissures. But there is no correspondence between the two. Just as a person's height is divided into short and tall, the eye axis also has long and short points, especially short eyeballs, medically called small eyeballs. The small eyeball manifests as hyperopia or even high hyperopia.

When people grow up, they gradually grow taller, and their eyes also have a process of growing up. Early in life, everyone is hyperopic. When the eyeballs are born, they grow hard, and the process of emmetropization is completed at about 8 years old. Therefore, children’s vision development also has a process.

So, does everyone turn their eyes squarely at around 8 years old? No, there are still many people with small eyeballs and hyperopia. They need to wear convex lenses to see clearly. Some people may also cause strabismus and amblyopia due to hyperopia.

Some people, although they have farsightedness, they can use the ciliary muscles to adjust the focus and obtain clear vision of seeing far and near. Such a situation belongs to hidden hyperopia. When looking at the distance, the eyes are relaxed and not tired. It is just that the ciliary muscles need to be focused when looking close. In hyperopia, the ciliary muscles need to be focused when looking far, and the ciliary muscles need to pay more when looking close. To put more effort, to make a simple analogy, look squarely at things, the ciliary muscles run and stop, often with rest, and farsighted eyes see things, the ciliary muscles have been running non-stop, so it is prone to visual fatigue. Patients with hyperopia may not only suffer from asthenopia, but also may have symptoms of accommodative fatigue such as eye pain, swelling of the brow arch, headache, insomnia, and memory loss.

Can hyperopia be treated?

For adolescents with hyperopia, ciliary paralysis muscles should be used to eliminate post-adjustment optometry glasses. Hyperopia in adulthood can be matched with eyes or treated with laser surgery, just like laser surgery for myopia.