What is astigmatism? Causes, signs and ways to prevent astigmatism

Astigmatism is one of the vision diseases that can appear in children and adults. Learn about this disease with Tnhelearning.edu.vn through the following article.

What is astigmatism?

Astigmatism is one of the common refractive errors of the eye , a common phenomenon of this pathology is that the image when looking into the eye is blurred.

Astigmatism is one of the most common refractive errors in the eye

Because the reflected image rays passing through the cornea and lens are not focused at one point on the retina, but focus on many points on the retina , causing the image signal to be transmitted to the brain through the nervous system. The optic nerve is altered and the resulting image is affected.

Symptoms of Astigmatism

Images when seen are blurred, distorted, blurred vision is a common symptom of astigmatism

The most visible symptoms in people with astigmatism include:

• The image when seen is blurred, distorted, eyes are blurred
• If you look at an object, you will see two or three shadows
• Eye fatigue, poor vision at all distances.
• Some other accompanying signs such as watery eyes, headache, neck pain, shoulder pain, etc. may also occur.

Causes of astigmatism

Astigmatism usually occurs mainly due to an altered curvature of the cornea. Normally, when light passes through the cornea and enters the eye, it will focus on one point, helping us to see things clearly.

Astigmatism usually occurs mainly due to an altered curvature of the cornea

However, when the cornea does not keep the perfect curvature but is deformed, the light entering the eye will be scattered to many different points (maybe in front or behind the retina) causing astigmatism.

In addition, astigmatism can also occur when the lens is abnormal, astigmatism has a high risk in subjects such as:

• If there is a family history of astigmatism, especially if both parents have astigmatism, the chances of children having astigmatism are quite high.
• Have nearsightedness, severe farsightedness or a history of eye surgery.
• Because the cornea or lens is degenerated with age , the elderly are often more susceptible.

Methods of treating astigmatism

The treatment of astigmatism may not require treatment with mild cases, but if it is severe, it is necessary to apply many treatment measures to avoid the disease from complicating the disease, seriously affecting vision. the following treatments:

Using prescription glasses: Most cases of astigmatism will be corrected by prescription glasses , however, patients must find out and visit a specialist to advise on the type of glasses suitable for the required level.

Astigmatism will be corrected with prescription glasses

Surgery: If you have severe astigmatism when prescription glasses are not effective, you must undergo surgery using a microsurgery knife or laser to reshape the cornea permanently.

If you have severe astigmatism, you need surgery

These can include the commonly seen astigmatism surgeries such as refractive change shaping corneal parenchyma (LASIK), refractive change resection corneal epithelium (PRK), refractive change shaping corneal flap. subepithelial (LASEK).

Ortho-K (Orthokeratology) customizes contact lenses specialized in treating astigmatism

Ortho-K Contact Lenses (Orthokeratology): A hard-wearing contact lens treatment for astigmatism, specially designed to temporarily change the shape of the cornea when worn at night , allowing the eye to have better vision. clearly visible the next day.

How to prevent astigmatism?

Work in a well-lit place, avoid too dark, wear eye protection

Except in cases of hereditary astigmatism, you can still prevent astigmatism by:

• Work in a well-lit place, avoid places that are too dark, wear eye protection when working with strong and bright light sources.
• Take time to relax your eyes when working in front of the computer , reading books, doing tasks that require meticulousness and attention.
• Living and eating reasonable nutrition, supplementing vitamin A for the body to nourish healthy eyes.
• Avoid possible orbital damage as well as treat eye defects early if any to avoid serious disease progression.

Above is the information related to astigmatism, hope through the above article you will have more useful and interesting knowledge.

Source: Saigon Eye Hospital

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