Myopia: can’t afford to hurt! Six eye diseases haunt you

Abstract: Generally speaking, retinal macular degeneration or lesions will occur only at the age of 80 and 90. However, because the eyeballs of myopia teenagers are inflated, the retina, choroid and other eye tissues degenerate early in the long-term pull.

1. Why are myopia prone to early cataract?

A: at present, the reason is unknown, but the fact is before us – in recent years, more and more people have developed cataract early because of high myopia.

cataract is an eye disease that causes vision loss due to lens opacity.

when light enters the eye, it needs to be refracted by the lens to reach the retina. Through the shape change of the lens, different refraction degrees are formed, so that we can see clearly from far to near, just like the “focusing” of mobile phone photography. So the lens is a very important organ in the eye!


lenses are transparent under normal circumstances, and light can pass through easily; Once it becomes cloudy, we will have vision problems.


in our daily life, we will feel that cataract is a “geriatric disease”, which only the elderly will get. In fact, there are also young cataract patients, and today, The biggest source of cataract in young people is that the ocular axis is too long (the degree of myopia is too deep).

why does myopia make cataract report early?

explanation 1: the lens is pulled

Myopia not only lengthens the eyeball, but also enlarges the width of the eyeball; The lens will also become diseased due to the pulling of the expanded eyeball. Explanation 2 of


: the change of substances in the eyeball


because the eyeball is elongated, the water contained in the posterior vitreous body will increase accordingly, and the compressive force on the lens will increase; Coupled with the changes of some metabolic substances in the eyeball, the lens changes early.

tips how to prevent cataract?


the environmental factor most likely to cause cataract is ultraviolet light.

suggestions: 1 If you are outdoors for a long time in the daytime, pay attention to the use of sunglasses; 2. Check whether your myopia glasses have anti ultraviolet (UV) function.

in addition, if the degree of myopia soars for several Baidu in a short time, you should suspect that it may be cataract and must be checked in time.

Why are people with myopia prone to flying mosquitoes?

A: the eye deformation caused by myopia will make the vitreous in the eye degenerate early and produce all kinds of plankton. This is flying mosquito disease.


many people have seen that there are floating objects like mosquitoes or insects flying around in front of them. This phenomenon is flying mosquito disease.

so, how did the flying mosquito disease come from? Vitreous liquefaction and posterior detachment are the main causes.

the eyeball is like an egg, most of which is filled by the vitreous body; The vitreous body is like egg white, which is a transparent and viscous colloidal substance.

with age, glass will “liquefy”, just as eggs will go bad after being put for a long time. Part of the vitreous of


liquefy into water, causing other parts to become sticky: some colloidal fibers gather together. When the eyeball turns around, these fibers float around in the eyeball, looking like ants flying around. If vitreous liquefaction continues to develop, it will also lead to vitreous and retinal separation, leading to “posterior vitreous detachment” and “retinal detachment”. The former is only the aggravation of the condition of flying mosquitoes, while the latter is a very serious complication!

if there is no myopia, posterior vitreous detachment usually occurs at the age of 50 ~ 60 years; If there is myopia, some people will have flying ant disease at the age of 20 ~ 30. People with myopia are more likely to have floaters because myopia leads to the enlargement of the eyeball, and the vitreous filling the eyeball will appear less, which will lead to the early liquefaction of the vitreous.

small knowledge

when do you need to worry about the deterioration of flying mosquito disease?

if you appear: 1 The number of “flying mosquitoes” has increased sharply; 2. See the light and shadow of lightning (the glass is pulling the visual screen mold); 3. Sudden drop of vision… These conditions may be the precursor of retinal detachment. Be especially careful.

3. Why are people with myopia prone to glaucoma?

A: the causes of glaucoma caused by high myopia are different. It is mainly eye swelling, pulling the optic nerve and causing damage to it. This is “normal intraocular pressure glaucoma”.

glaucoma is a common cause of blindness, which is usually related to “abnormal intraocular pressure”. Because glaucoma can steal your vision and vision silently before you find any abnormalities, it is called “the thief of vision”.

glaucoma caused by abnormal intraocular pressure

our eyes are like a water ball. There will be some water in and out of the eyeball at any time to achieve balance and maintain the shape of the eyeball. This is the role of intraocular pressure. When our eyeballs are full of water and can not be discharged, the eyeballs will be very swollen and hard, and the intraocular pressure will rise abnormally, resulting in the death of retinal nerve cells and the damage of visual field.

normal tension glaucoma

the probability of glaucoma in people with high myopia is 7 times that in people without myopia and 3 times that in people with low myopia.

people with high myopia often have low intraocular pressure, but the optic nerve has the performance of glaucoma. It turns out that after the axis of myopia is elongated, the layer of optic nerve cells on the retina is pulled, and the compressive capacity is reduced. Although the intraocular pressure is normal, it has caused damage to this layer of fragile cells. What’s terrible is that these injuries can’t be recovered!

small knowledge

high myopia to be careful to prevent glaucoma

high myopia caused by green eye, usually there is no acute attack (including headache, eye pain, etc.), so the treatment opportunity is often delayed.Therefore, people with high myopia should go to the ophthalmology regularly for half a year or a year to check the intraocular pressure and fundus, so as to find the symptoms of glaucoma early.

4. Why are people with myopia prone to macular hemorrhage?

A: myopia teenagers have cracks in the macula due to eyeball expansion, and new blood vessels emerge. These new blood vessels are too fragile and easy to bleed.


macula are located in the center of the retina just behind our eyeballs. It is the most sensitive part of vision and the place most closely related to vision. If the macula is normal, the visual acuity can reach 1.0; If the macula is damaged, the vision is less than 0.1!

teenagers with high myopia are prone to bleeding in the macula in the center of the retina, This is one of the two major causes of blindness in young myopic people (for another reason, please see question 34: Why are myopic people prone to retinal detachment?).

myopic patients will pull and thin many tissues and even produce cracks because of the expansion of the eyeball. Once there is a crack in the macula, the choroid under the retina will be damaged (located between sclera and retina) new blood vessels are drilled through these cracks. These fragile new blood vessels are easy to bleed. When macular bleeding, there will be a dark shadow in the center of the eyes, the line of sight will become foggy, and finally even lead to blindness.

5. Why are myopic people prone to myopic maculopathy?

A: juvenile myopia, after eye expansion, the retina and choroid are in a pulling state for a long time, and degenerate over time. In particular, retinal macular degeneration is more serious, which is called myopic maculopathy.


because of the eye expansion caused by myopia, the retina is directly pulled, and the macula in the center of the retina is greatly affected. Not only is there macular bleeding, It is one of the two major causes of juvenile blindness (see question 32: Why are people with myopia prone to macular hemorrhage?) and macular disease, which is one of the two major causes of blindness in the elderly. Both vertical and horizontal are blind. What’s more, macular disease is currently incurable in medicine! So prevention is very important!

Generally speaking, the degeneration or lesions of the macula of the retina will occur only at the age of 80 and 90, but because the eyeballs of myopia teenagers are inflated, the retina, choroid and other eye tissues degenerate early in the long-term pull. Of course, macular lesions rarely occur in children with high myopia, but they will come early to people with high myopia in their 40s and 50s.

macular lesions seriously affect vision and cannot be treated. Many people with macular lesions regret not protecting their eyes. Therefore, once you are short-sighted, you must continue to deepen and worsen some prevention measures to avoid more severe pulling of eye tissue. Otherwise, macular lesions may occur in your beautiful youth.

6. Why are myopia prone to retinal detachment?

answer: high myopia will lengthen the ocular axis, make the retina thinner and the vitreous liquefied early, and then lead to retinal holes and retinal detachment.

teenagers with high myopia are prone to retinal detachment. This is one of the two main causes of blindness in young myopic people (another reason, please see question 32. Why are myopic people prone to macular hemorrhage?).

retina is the optic nerve membrane formed by the optic nerve.

high myopia is more likely to produce vitreous liquefaction after eye expansion (for the causes of floaters, please see question 30: Why are people with myopia prone to floaters?) in the process of liquefaction, the vitreous should be separated from the retina, which is easy to pull the retina and produce holes.

The retina clings to the wall of the eye, just as wallpaper in a room is attached to the wall. Once there is a hole in the retina, the water in the eye room is easy to pour into the hole, which makes the retina separate like wallpaper, and finally the whole retina will fall off, which is retinal detachment.