Causes of cataracts

Written by Peng Xi Feng

Ophthalmology

Updated on September 14, 2024

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Various causes, such as aging, genetics, local nutritional disorders, immune and metabolic abnormalities, trauma, poisoning, radiation, etc., can lead to metabolic disorders of the lens, causing the denaturation of lens proteins and resulting in cloudiness; this is called cataract. Cataracts can be divided into congenital and acquired. Congenital cataracts, also known as developmental cataracts, are divided into anterior polar cataracts, posterior polar cataracts, nuclear cataracts, and total cataracts. Acquired cataracts are divided into senile cataracts, complicated cataracts, traumatic cataracts, metabolic cataracts, radiation cataracts, and those related to medications and poisoning.

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Written by Wang Hui Zhen

Ophthalmology

1min 14sec

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Advantages and disadvantages of cataract surgery for the elderly

Any surgery carries risks, and cataract surgery is no exception. However, many elderly people have mature cataracts that require prompt surgical treatment. If not addressed timely, it can lead to blindness or even cause secondary glaucoma, leading to symptoms such as eye pain, headaches, nausea, and vomiting. In some advanced cases, it can lead to neovascular glaucoma, making it difficult to control intraocular pressure. Cataracts are a vision-impairing disease caused by the clouding of the lens, which is an important optical component in the human eyeball. Normally, the lens is transparent. In elderly people, the lens proteins often degenerate and age, leading to cloudiness and various degrees of vision impairment. It is advisable for those with cataracts to seek prompt ophthalmologic care and, if necessary, undergo cataract removal surgery. Complications and sequelae from cataract surgery may include postoperative infection, shallow anterior chamber, corneal edema, explosive bleeding, macular edema, and more.

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Written by Peng Xi Feng

Ophthalmology

48sec

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How is a cataract formed?

Inside the eyeball, there is a relatively important transparent tissue called the lens. Clinically, clouding of the lens is referred to as cataracts. Many factors, such as aging, genetics, metabolic abnormalities like diabetes, trauma, radiation, poisoning, and local nutritional disorders, can lead to damage to the capsule of the lens, increasing its permeability and losing its barrier function, or causing metabolic disturbances in the lens. This can cause the proteins in the lens to denature, leading to cloudiness of the lens, which is known as cataracts. Under a slit lamp microscope, varying degrees of cloudiness in the lens can be observed.

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Written by Peng Xi Feng

Ophthalmology

48sec

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Cataract is what?

All sorts of reasons, such as aging, genetics, local nutritional disorders, immune and metabolic abnormalities, trauma, poisoning, radiation, etc., can cause metabolic disorders in the lens, leading to the denaturation of the lens proteins and resulting in opacity known as cataract. At this point, the light is obstructed by the opaque lens and cannot be projected onto the retina, causing blurred vision. It is commonly seen in people over the age of forty, and the incidence increases with age. This disease can be divided into congenital cataracts and acquired cataracts. Congenital cataracts are also known as developmental cataracts, and there are six types of acquired cataracts.

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Written by Hu Shu Fang

Ophthalmology

41sec

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Does cataract cause headache?

The main symptoms of cataracts include a decline in vision, with both near and far objects appearing unclear, and blurry vision. There is no significant eye pain or headaches, nor does it cause redness in the eyes. If headaches do occur, it is important to investigate the cause, such as checking if there is an increase in eye pressure or if the headache is caused by glaucoma, and to treat according to the specific cause. However, in the later stages or over-mature stage of cataracts, the lens may dissolve, which can potentially lead to phacolytic glaucoma, but this condition is very rare.

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Written by Zhou Qing

Ophthalmology

1min 24sec

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Early symptoms of cataracts

The early symptoms of cataracts can manifest as day blindness or night blindness. When the cloudiness of the lens originates from the middle of the eye, the strong daylight and illumination can cause the pupil to contract, which then blocks the light from entering the eye, resulting in day blindness. When the cloudiness of the lens is located around the periphery of the eye, the dim light at night cannot reach the peripheral retina, thus causing night blindness. Other early symptoms of cataracts include the following: when the cloudiness of the lens is located at the pupil, patients may see fixed dots or patches of shadow in front of their eyes. However, since cataracts share similar characteristics with floaters, they should be distinguished; the shadows in floaters can move, while the shadows in cataracts are fixed. Varying degrees of blurry vision are also early symptoms of cataracts. Patients may experience gradually increasing blurriness of vision, often perceiving halos around lights or seeing colors of objects as dull and unclear. The early development of cataracts is quite slow and can be determined by the deepest and most obvious part of the lens cloudiness and its development condition.