Farsightedness is to see far clearly, and it is not clear to see near clearly, is it presbyopia
Farsightedness is to see far clearly, and it is not clear to see near clearly, is it presbyopia
Hearing the farsightedness,
Most people think that they can see far and clearly, but they can't see clearly, but in fact, they are not.
The usual emmetropic eye is the eye that can see far and near clearly, and parallel rays of light enter the eye.
Focus on the retina to form a clear image of the object; And farsightedness,
Parallel light rays entering the eye are not focused on the retina, but after being focused on the retina.
A convex lens is needed to concentrate the light in order to focus on the retina
to be able to see a clear image of the object.
In layman's terms, the farsighted eye is actually not clear when it sees far and near.
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Is farsightedness equal to presbyopia? Why do people have farsightedness? The vast majority of farsightedness is due to the small size of the eyeball.
The short anterior and posterior diameter of the eye is medically referred to as a short axial eye.
This eyeball is not the same as what we usually call small eyes.
When we talk about small eyes, big eyes actually refer to the size of the fissure between the upper and lower eyelids (medically called palpebral fissures).
Some people with small eyeballs have small palpebral fissures, but there is no correspondence between the two.
Just as there is a difference in height and shortness of a person's head, there is also a difference in the length of the eye axis.
Particularly short eyeballs are medically known as microphthalmia.
The microsphere manifests as farsightedness or even hyperopia.
People grow up from a young age, and they gradually grow taller, and their eyes also have a process of growing.
In the early stages of life, everyone is farsighted.
The eyeball is long at birth, and the emmetropia process is completed around 8 years old.
Therefore, there is also a process of children's vision development.
So, does everyone become an empathic eye around the age of 8? No
There are still many people whose eyeballs are small and in a state of farsightedness, and they need to wear convex lenses to see clearly.
Some people may also develop strabismus amblyopia due to farsightedness.
Some people, although they have farsightedness, they can use the ciliary muscles to focus.
Gain clear vision that can see far and near.
Such a condition is recessive hyperopia.
When looking at the distance, the eyes are in a relaxed state, not tired, but the ciliary muscles need to be focused when looking close.
The ciliary muscles need to be focused when they are far away, and the ciliary muscles need to put more effort when they are close.
To make a simple analogy, the ciliary muscles run and stop,
Often resting and farsighted, the ciliary muscles keep running,
Therefore, it is easy to have eye strain.
Patients with farsightedness may not only experience visual fatigue, but also may have accommodative fatigue symptoms such as eye pain, swelling of the eyebrow arch, headache, insomnia, and memory loss.
Can farsightedness be treated? For adolescent hyperopia patients, optometry glasses should be used to eliminate and adjust the cycloplegic muscle.
Hyperopia in adulthood, which can be treated with eyes or through laser surgery,
Just like laser surgery for myopia.