What is posterior cataract? What causes posterior cataracts?

After cataract extracapsular extraction or lens trauma, the lens cortex is not completely absorbed, and the residual part left behind is secondary cloudy, mixed with the residual capsule of the lens, forming an opaque organic film, or due to the proliferation of epithelial cells, forming transparent pearly bodies, which seriously affects vision and is called posterior cataract, referred to as "posterior disorder".

After extracapsular cataract removal or lens trauma, the residual cortex and epithelial cells that fall off the posterior capsule of the lens proliferate, forming a translucent membrane in the pupillary area, is called posterior cataract.

Posterior cataract refers to the formation of a fold in the posterior capsule of the lens formed after extracapsular extraction of cataract or after partial cortical resorption of posterior cataract. Residual part of the cortex can exacerbate the opacity, leading to distortion of vision and decreased vision.

After-cataract refers to a special condition in which the lens cortex remains in the pupil area or forms a fibrous membrane after the cataract is surgically removed or the traumatic cataract cortex is partially absorbed. This complication is particularly prevalent and serious in early intraocular lens implantation procedures where the importance of lens epithelial cell and cortical clearance is not well understood. Even in the 90s of the 20th century, after ECCE combined with posterior chamber intraocular lens implantation surgery, this complication remained a major clinical problem, with an incidence of up to 25% to 50%.

The structure and morphology of posterior capsule opacity are complex, mainly related to the amount of residual cortex after surgery, the presence or integrity of the posterior capsule, and the severity of postoperative inflammatory response.

After cataract surgery, after the long, cataract, called posterior cataract posterior cataract has many reasons, there are the following points, one, age, moon clearing, nonsense, the more the probability of posterior cataract, because of cell proliferation, faster, especially, children, cataract, basically one hundred percent, occurrence, posterior cataract, two, and the surgeon itself also has a relationship, many doctors in the pupil y, area, dare not go to get the goods to get not clean, but also easy to cause, posterior cataract, three, It is related to the patient's eye itself, and the patient, with iritis, glaucoma, diabetes and other diseases, can also cause cataracts after being found. The most important harm of cataract is to affect vision and cause vision loss, which will affect work and life in the future, for children, cataract can also cause, cause, appliance, functional development disorders such as causing amblyopia strabismus This is more impactful for children, the second, cataract, if it appears, when the expansion period, will cause the attack of acute glaucoma, at this time the patient will have severe eye symptoms, headache, nausea, vision accumulation decline, need emergency treatment, and some, overripe cataract, It can cause, cortical allergic uveitis, manifested by the patient hydrochloric acid, Zheng Yuanhong, which is his effect on function, severe, cataract, and will also affect the observation of fundus diseases. When the cataract is very severe, the fundus cannot be observed, so the observation of fundus disease is relatively large.

After cataracts, they do not cause other diseases, the most common is increased intraocular pressure, which affects vision. The worst outcome is blindness, and everything else is fine. Therefore, this is also a problem that cannot be ignored and must be dealt with in a timely manner.

After cataracts occur, if not timely**, it will gradually progress to eye blindness.

Cataract is one of the most common eye diseases in the world, with many causes, including congenital and traumatic drugs, among which the most common is caused by advanced age.

Due to the limitations of technology and the lack of intraocular lenses, cataract surgery in the past often waited until it was "mature", but in fact, the degree of cataract sclerosis in maturity will increase, so more ultrasound energy is required in the operation, which increases the risk of surgery.

In addition, overmature cataracts may increase the risk of iris inflammation, glaucoma, and lens displacement.

Cataracts may present with amblyopia or secondary glaucoma. Therefore, if there is cataract, it must be carried out actively and effectively to avoid these complications. Cataracts are often caused by opacity of the lens, and are generally divided into congenital cataracts and acquired cataracts.

Congenital cataract is not actively carried out**, and it is likely to develop form-deprivation amblyopia. Therefore, it is necessary to take the child to the hospital as soon as possible and have cataract correction surgery as soon as possible.

In the case of acquired cataracts, surgery is often required as soon as possible during the expansion period**, and if surgery is not performed at this time, secondary glaucoma is likely to occur. At this time, the eyes will have a feeling of swelling and pain, and the patient is often more painful, so although cataract is not a major disease, it should be carried out as soon as possible**, and the current cataract surgery ** is still very mature.

In the development of cataracts, if not timely, there will be many serious complications, such as glaucoma, pigmentitis, etc., these eye diseases mostly occur in the middle and late stages of cataracts, such as swelling and overmaturity, which can not only cause blindness, but also sometimes cause severe inflammation in the eye, resulting in eye atrophy; Some patients may be unable to tolerate long-term eye pain and eventually have to undergo enucleation. Therefore, everyone is reminded that cataracts have progressed to a certain level and must undergo surgery**.

Cataract is a disease that occurs on the lens inside the eyeball, any opacity of the lens can be called cataract, but when the lens opacity is mild, it does not significantly affect vision without being noticed or ignored and is not included in the list of cataracts. According to surveys, cataracts are a common cause of blindness and visual disability, with about 25% of humans suffering from cataracts.

Causes of cataracts.

1. Dehydration in the elderly, studies in recent years have found that if the elderly are dehydrated or suffer from severe diarrhea, they are prone to cataracts, which is also a common senile cataract. The fluid content in the human eye is high, and when the human body is dehydrated and causes lens protein degeneration, it will eventually cause the lens to become cloudy and induce cataracts.

2. Endocrine disorders, endocrine disorders can promote the production of cataracts, which is enough to explain that cataracts occur higher in diabetic patients than in ordinary people.

3. Sunlight and ultraviolet rays, sunlight and ultraviolet rays are one of the leading causes of cataracts, and over the years, people have noticed that sunlight is involved in the formation of human cataracts. 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.

4. The temperature of the outside world, in fact, do you know that the first cataract is closely related to the temperature of the outside world, and the incidence of cataract in workers over 60 years old who work in high temperature by foreign scholars has increased significantly.

5. Hypoxia: In the case of hypoxia, sodium and calcium in the crystal can be increased, potassium and vitamin C can be reduced accordingly, and lactic acid can be increased, which can promote the formation of cataracts. This is also one of the leading causes of cataracts.

The concept of a cataract is that the clouding of the lens is called a cataract if it is formed for any reason. Cataracts occur for many reasons, the most common being senile cataracts. With the increase of age, the overall cell metabolic rate of the person decreases, and the lens epithelial cells are unable to maintain normal transparency, resulting in the occurrence of opacity, which is called senile cataract.

Congenital cataract is caused by a viral infection during the development of the fetus, or a genetic defect that carries the fetus, resulting in the clouding of the lens before birth, resulting in congenital cataracts. Metabolic cataracts, most commonly diabetic cataracts and hypocalcaemic cataracts. For example, if the blood sugar rises abnormally, the cell metabolism of the patient's lens is abnormally affected by high blood sugar, and the transparency decreases, and the cataract is called metabolic cataract.

In addition, there is radiation cataract, which is exposed to certain radioactive materials, and these radiation rays penetrate the cornea to the lens, causing the destruction of lens epithelial cells, resulting in a decrease in transparency, causing radiation cataracts. There is also traumatic cataract, when the eye is hit by a traumatic impact, which destroys the capsule of the lens, causing the lens epithelial cells to be affected and clouded. It can be seen that no matter what the reason, as long as the metabolism of the lens epithelial cells is affected, so that it cannot maintain normal transparency, the lens is clouded, and cataract will be formed.

After the formation of cataracts, the light that enters the eyes of the patient is affected, so blurred vision, decreased vision, and in severe cases, blindness.

There are many types of cataracts, and the causes are very different, but they are mainly divided into the following:

1.Congenital cataract: caused by heredity, chromosomal variation, intra-fetal infection, etc

Senile cataract: It is an aging phenomenon in which with age, the lens (the same below) will slowly harden and become cloudy, resulting in vision impairment. As far as is currently understood, the pathogenesis of senile cataract is related to nutrient metabolism, ultraviolet rays, hypoxia, endocrine, sclerosis and dehydration.

3.Concurrent cataracts: cataracts complicated by intraocular diseases4

Metabolic cataracts: cataracts caused by endocrine diseases or biochemical abnormalities5Drug-induced cataracts:

Long-term use of steroid sex medications is a cause of this type of cataract6Traumatic cataracts**: caused by car accidents, blunt force injuries, puncture wounds to sharp objects, or penetrating intraocular foreign bodies.

7.Posterior cataract: refers to the clouding of the lens formed after extracapsular cataract removal surgery, or after partial cortical resorption of traumatic cataract.

The above are the causes of various types of cataracts, I hope it can help you.

Various causes such as aging, genetics, local nutritional disorders, immune and metabolic abnormalities, trauma, poisoning, radiation, etc., can cause lens metabolism disorders, resulting in lens protein denaturation and clouding, leading to cataracts. The disease can be divided into congenital and acquired:1

Congenital cataract, also known as developmental cataract, mostly exists before and after birth, mostly quiescent, can be accompanied by hereditary diseases, there are two categories: endogenous and exogenous, endogenous and fetal development disorders, exogenous is caused by damage to the lens caused by systemic lesions of the mother or fetus, congenital cataract is divided into anterior cataract, posterior cataract, circumnuclear cataract and total cataract. 2.Acquired cataract after birth due to systemic diseases or local eye diseases, abnormal nutritional metabolism, poisoning, degeneration and trauma caused by lens opacity, divided into 6 types:

Senile cataract, the most common, also known as age-related cataract, is more common in people over 40 years old, and increases with age, and is related to many factors, such as the slow metabolism of the elderly is related to degenerative changes, and some people believe that it is related to long-term sunlight exposure, endocrine disorders, metabolic disorders and other factors, according to the location of the initial opacity can be divided into two categories: nuclear and cortical. Concurrent cataract (complicated by other eye diseases). Traumatic cataracts.

Metabolic cataracts. Radiation cataracts. Drugs and toxic cataracts.

Cataracts are caused by clouding of the lens. Because our lens also "retires", with the increase of age or trauma and other reasons, the lens of the human eye will gradually become cloudy, and light cannot be transmitted, resulting in vision loss. In other words, the culprit of cataracts is the lens.

Surgery is currently the only effective way to cataract, and phacoemulsification combined with intraocular lens implantation is the most common. In general, our intraocular lenses can be divided into three categories: monofocal, multifocal and continuous visual range intraocular lenses. Of course, not all cataract patients need immediate surgery, and it is necessary to go to a professional medical institution for diagnosis and examination to ensure the best results.

Cataract is a disease of cloudy crystals, which is more common in the elderly, of course, there are congenital cataracts, which can be completely ** by surgery.

Senile cataracts.

Senile cataract is the main type of cataract, as the name suggests, it mainly occurs in the elderly, and the increase of age, aging of the eyes and other aspects are the main factors for the occurrence of senile cataract.

Congenital cataracts.

Congenital cataract generally refers to the cataract that occurs within 6 months of birth, and this kind of cataract is generally produced in the mother's body due to the influence of viruses such as colds or drugs.

Concurrent cataracts.

Concurrent cataract is generally a concurrent cataract caused by some eye diseases such as glaucoma or some systemic diseases. Therefore, for this type of cataract, it is also important to have a positive primary disease.