Is there any relationship between presbyopia and cataracts?

Everyone has heard of cataract, this disease mostly occurs in middle-aged and elderly people, because with the increase of age, their vision will become worse and worse, if there is cataract will seriously affect their life, many people can not distinguish between cataract and presbyopia, let experts introduce what are the differences between presbyopia and cataract.

In the human eyeball, facing the black eyeball, there is a transparent biconvex disc-shaped group, because with the solid weaving, it is called the lens. Cataract is an eye disease in which the lens becomes opaque and changes from transparent to opaque, preventing light from entering the eye and reducing vision. This lesion is like a camera lens that has become opaque because it has been contaminated.

Lens opacity develops slowly in the initial stage, up to several months or even years, and some stay at this stage for a long time without development. However, if it continues to develop, it is the expansion period, in this period, the thickness of the crystal increases due to the full swelling of the internal fibers, and the refractive power of the eye increases due to the partial convexity, resulting in temporary myopia.

At this time, the presbyopia power can be fully or partially offset by the myopia degree, and the elderly will feel that their near vision is clearer than in the past, and they can switch to reading glasses with a lower power, or even do not need to wear glasses. Later, glaucoma is secondary because the thickness of the lens increases, and the ** part becomes convex, which will not only cause temporary myopia, but also make the anterior chamber of the eye shallow.

If the anterior chamber becomes shallow, in severe cases, it will cause the angle of the atrial to occlude, which will block the flow of aqueous humor and cause glaucoma. Therefore, if the near vision of the elderly suddenly becomes "better", it is necessary to be alert to whether there is an aggravation of cataracts, and closely observe whether there is secondary glaucoma.

For the elderly, cataract and presbyopia seem to be difficult to distinguish, but there are tricks.

1.Presbyopia doesn't see what is near clearly, but what is far away is much clearer.

2.Cataracts, whether you can see far or near, are like a veil over your eyes. If the cataract is not timely, it may cause other eye diseases such as glaucoma, so remind the elderly that once their vision is blurred, they should go to a regular hospital for a check-up to avoid delaying the condition.

These differences show that cataract cannot be confused with presbyopia, presbyopia is normal for the elderly, because most of the elderly nowadays will have presbyopia, but cataract is different, because cataract is an eye disease, its severity is much greater than presbyopia, so we need to distinguish between the two in order to seek medical attention as soon as possible.

No, presbyopia refers to the weakening of the focusing function of the lens with age, and the phenomenon of blurred vision when seeing near objects such as reading the newspaper, presbyopia can be improved with the help of reading glasses, but cataract is due to the clouding of the lens resulting in a decrease in vision, which needs to be solved by a special cataract program.

Many older people experience blurred vision, but when it comes to the causes, they vary.

The two most important **, one is presbyopia, and the other is cataract, today I will talk to you about their similarities and differences.

First of all, both cataracts and presbyopia have a lot to do with age, and in general, the older you are, the higher the incidence; Second, both have varying degrees of vision loss.

But in addition to this, the difference between cataract and presbyopia is also very clear.

First, cataracts are not clear from far and near, as if they are separated by a veil, and the feeling of "seeing flowers in the fog"; Presbyopia, on the other hand, is usually difficult to see up close, but it is clear at a distance.

Second, if you are not afraid of trouble, presbyopia can be solved with glasses, which usually does not cause other eye diseases; Cataract itself can cause blindness, and may also cause other malignant eye diseases such as glaucoma, which need to be timed**.

Presbyopia is the need to change the refractive power by adjusting when the eye sees near objects, and this adjustment function is achieved by the lens under the action of the ciliary muscle, by changing the thickness so that the focus falls on the retina. With age, the lens gradually hardens and the function of the ciliary muscle declines, and this adjustment becomes more and more difficult, resulting in blurred near vision, swollen eyes, headaches and other symptoms. This is what we often call presbyopia.

Presbyopia usually occurs after the age of 45, but it is only necessary to add an appropriate convex lens (commonly known as reading lenses) to the front of the eye to see near objects.

Age-related cataracts, on the other hand, are caused by aging when the lens is clouded and obscured from vision, and there are generally no other ocular symptoms.

Senile cataract is divided into the initial stage, the swelling stage (immature stage), the mature stage, and the overripe stage. During the expansion period, the lens cortex swells due to water absorption, and the iris tissue in front will be pushed forward, the anterior chamber will become shallow, and the outflow of aqueous humor will be blocked, and acute angle-closure glaucoma will easily occur, with symptoms such as redness and pain in the affected eye, sharp loss of vision, nausea and vomiting. During the overripe phase of cataracts, the lens cortex decomposes and liquefies into the anterior chamber, causing complications such as allergic uveitis or crystal-soluble glaucoma.

Cataract and presbyopia are two different disease concepts, cataract is due to the gradual increase in crystal density with age, and the degeneration of crystal protein, resulting in a decrease in the transparency of the crystal and affecting vision, which is called cataract. Presbyopia is a function that gradually weakens the regulatory function of the ciliary muscles as we age, increases the density of the crystals, decreases the elasticity of the crystals, and gradually weakens, making us unable to read and work at close range, thereby causing a decrease in the adjustment of the eyes, which is called presbyopia. In people with presbyopia, distant vision is not affected, but near vision is affected; Cataracts, on the other hand, are seen far and near, and vision decreases, which cannot be adjusted by wearing glasses.

Presbyopia generally appears after the age of 40, and with the increase of age, the degree of aging will deepen year by year, so when we wear reading glasses, we should not match them expensive, because with age, the degree of presbyopia will increase year by year.

Generally speaking, presbyopia does not see things in the near area clearly, but it can see more clearly in the distance, and cataract is caused by the cloudy lens, which blocks part of the light from entering, so it is not clear whether you look far or near. Some cataracts will change from presbyopia to clear near vision at a certain stage, but after further development, it is not clear to see far and near.

Many people confuse presbyopia and cataracts, but what about these two diseases?

What are the symptoms of presbyopia?

Typical symptoms of presbyopia: difficulty seeing near and far.

In contrast to myopia patients, patients with presbyopia will gradually find that they cannot see small characters clearly when reading at close range, so that they unconsciously tilt their heads back or take the book or newspaper to a farther place to read the text, and the reading distance required will gradually increase with age.

Typical symptom 2 of presbyopia: myopia cannot be sustained.

Due to inadequate lens adjustment, the near point gradually becomes farther away, and the patient often struggles to see near objects clearly. If this force exceeds the limit, it will cause tension in the ciliary body. When looking at distant objects, the tension in the ciliary body does not relax immediately, resulting in temporary myopia.

When you look at nearby objects, there will be a brief blur, which is a sign of slow accommodative response. Fatigue occurs when the ciliary muscles are functioning close to their functional limits and are unable to work continuously.

Because of the decreased accommodative power, the patient has to work close to the limit of binocular accommodation, so it cannot last too long. At the same time, due to the linkage effect of the adjustment sleeve, excessive adjustment will cause the sleeve to be too heavy, which is also a factor causing discomfort. So it's easy to read the newspaper **, the handwriting is in pairs, and in the end you can't read it.

Some patients may even experience symptoms of eye fatigue such as eye droppings, watery eyes, headaches, and itchy eyes.

Typical symptom 3 of presbyopia: Reading requires stronger light.

Lack of light not only increases the visual discernment threshold, but also dilates the pupil and forms a large circle of diffusion on the retina, making the symptoms of presbyopia more pronounced. As they get older, they tend to get tired even when working in close proximity during the day, so people with presbyopia like to use brighter lights when reading at night. Sometimes the light is placed between the book and the eye, both to increase the contrast between the book and the text, and to reduce the pupils.

However, the light in front of you will inevitably cause glare interference. The closer the light source is to the eye axis, the greater the impact on vision.

Is presbyopia a cataract?

Presbyopia is not a cataract, it is a two-disease disease.

Presbyopia] can't see things around you clearly, but things in the distance are much clearer;

Cataract] Whether you see far or near, you can't see clearly, like your eyes are covered with gauze. Cataracts, if left unchecked**, can lead to other eye diseases such as glaucoma. In addition, cataract and presbyopia also differ in the degree of harm and the best method.

Presbyopia] may cause eye strain, blurred vision, and may be accompanied by symptoms such as swollen eyes and headaches. However, presbyopia generally does not cause other eye diseases.

Cataracts] can seriously affect the quality of life of patients. If left untimely**, it can trigger other eye diseases such as glaucoma. As the condition worsens, vision gradually decreases, which can eventually lead to blindness.

Presbyopia can't see things clearly, and things are blurry, and presbyopia is the inability to see things at close range, which is more blurry. Presbyopia is not caused by cataracts, but by the deterioration of the ability of the ciliary muscles to adjust.

Presbyopia can be seen in the distance, but it is not clear when looking at the near place, usually occurs around the age of 40, and generally speaking, it is more obvious over the age of 45. Cataracts are usually found in people over the age of 60, and if they occur, they are not clear whether they can see far or near.

The symptoms of presbyopia are blurred vision, there are often some headaches, and presbyopia is not a cataract, so some people don't have to worry.

Cataract caused by the increase of old age. In general, it is more common to occur in both eyes, and the occurrence of the two eyes may be different, including the degree may not be consistent. However, both eyes are senile cataracts.

The main reason for the difference is that the light is blocked and cannot be projected to the retina, so in this case, it depends on whether it is the cause of trauma. If it is, it is generally monocular. Cataracts that belong to traumatic types, like both eyes, as I said earlier, belong to senile people.

It has to do with age, or it may be because the eyes are one in front and one behind. There are also differences in the human body, one person has one eye with a shudder, but the other eye has not at all, but after several years, it will also have it. But I still have to say that basically there are still more eyes.

It's like this is the case with my grandmother who is 80 years old, and she has already had both eyes. Therefore, under normal circumstances, after one eye, it is necessary to check the other eye, and if you find it, you can go to see it in time, and it is best not to delay it for a long time, so that the elderly will relieve some of the pain. Earlier they made their eyes clear.

You don't have to see a piece of cloudiness and blurred vision all day long, so don't worry about this aspect being a minor problem now, it's easy to solve, and I hope my explanation of vanity can bring you some help. I also wish the old man good health, and I hope for your and my opinions.

Age-related cataract refers to the opacity of the lens that begins in middle-aged and elderly people, and the prevalence increases significantly with age. Because it mainly occurs in the elderly, it used to be called senile cataracts. As far as is currently understood, the onset of senile cataract can be related to the following factors:

1. Sunlight and ultraviolet rays: Over the years, it has been noted that sunlight is involved in the formation of cataracts in humans. Under the influence of ultraviolet light, phosphorus ions may combine with calcium ions in the aging lens to form insoluble calcium phosphate, which leads to hardening and calcification of the crystals.

At the same time, ultraviolet rays also affect the redox process of the lens, which promotes the denaturation of lens proteins and causes cataracts.

2. Hypoxia: In the case of hypoxia, the sodium and calcium in the crystal can be increased, and the potassium and vitamin C can be reduced accordingly, and the lactic acid can be increased, which can promote the formation of cataracts.

3. Nutrient metabolism: Through animal observation, it is found that the deficiency of certain vitamins and trace elements is related to the formation of cataracts, such as calcium, phosphorus, vitamins E, A, B2, etc.

4. Hardening and dehydration: In the case of dehydration, the fluid metabolism in the body is disordered, and some abnormal substances will be produced and the crystals will be damaged. Animal experiments have proved that after hypertonic dehydration, the crystals appear empty.

5. Outside temperature: foreign scholars have surveyed that the incidence of cataract in workers over 60 years old who work in high temperature is significantly higher.

6. Endocrine: Endocrine disorders can promote the production of cataracts, which is enough to explain that the occurrence of cataracts in patients with sugar liquid and cryptouric disease is higher than that of ordinary people.

Cataracts are not necessarily caused in both eyes, if it is caused solely by age, it may be in both eyes, but if it is caused by other factors, such as trauma or other factors such as physical injury, chemical injury, and surgery, it may be monocular disease.

Whether cataracts will occur in both eyes, it needs to be determined according to the specific situation, senile cataracts are caused by increasing age, most of them occur in both eyes, although the degree of occurrence of the two eyes is not the same, but Liang Tang is also bright and more common in both eyes at the same time, if it is a single eye, it is generally seen in trauma.