How Does Lasik Correct Astigmatism

How Does Lasik Correct Astigmatism?

Astigmatism is a common vision problem that affects many individuals around the world. It occurs when the cornea or lens of the eye has an irregular shape, causing blurred or distorted vision. Fortunately, there are several treatment options available to correct astigmatism, with one of the most effective being Lasik surgery.

Lasik, which stands for Laser-Assisted In Situ Keratomileusis, is a popular refractive surgery procedure that helps correct various vision problems, including astigmatism. During the surgery, a laser is used to reshape the cornea, allowing light to focus properly onto the retina, thus improving vision.

Here is a detailed explanation of how Lasik corrects astigmatism:

1. Pre-surgical Evaluation: Before undergoing Lasik surgery, the patient undergoes a comprehensive eye examination. This evaluation includes measuring the cornea’s shape, checking the patient’s prescription, and assessing the overall health of the eyes. The surgeon will determine the severity of astigmatism and whether the patient is a suitable candidate for Lasik.

2. Creation of the Flap: During the surgery, the surgeon creates a thin, hinged flap on the cornea using a microkeratome or femtosecond laser. The flap is lifted to expose the underlying cornea.

3. Reshaping the Cornea: The surgeon then uses an excimer laser to remove tiny amounts of corneal tissue, precisely reshaping the cornea to correct the irregularities that cause astigmatism. The laser removes more tissue in one direction than the other, targeting the steeper curvature of the cornea. By making the cornea more symmetrical, the laser helps focus light properly onto the retina.

4. Flap Replacement: After the cornea is reshaped, the surgeon carefully repositions the flap back into place, where it adheres naturally without the need for stitches. The flap acts as a natural bandage, promoting faster healing and reducing post-operative discomfort.

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5. Recovery and Follow-up: Following the procedure, the patient is given post-operative instructions to ensure proper healing. Most patients experience improved vision within a few days, with the full effects of Lasik becoming apparent within a few weeks. Regular follow-up visits with the surgeon are essential to monitor healing and address any concerns.


1. Is Lasik suitable for all types of astigmatism?
Lasik is effective in treating most types of astigmatism. However, the severity of astigmatism and the overall health of the eyes play a significant role in determining the suitability for surgery. Your surgeon will evaluate your specific case to determine the best course of action.

2. Can Lasik correct astigmatism completely?
Lasik can significantly reduce astigmatism and improve vision, but it may not always eliminate it entirely. The goal of Lasik is to minimize the need for glasses or contact lenses, but some patients may still require a slight prescription after the procedure.

3. Are there any risks associated with Lasik surgery?
As with any surgical procedure, Lasik does carry some risks. These risks include dry eyes, glare, halos, and overcorrection or undercorrection of vision. However, serious complications are rare, and most patients achieve excellent results.

4. What is the recovery process like after Lasik?
The recovery process after Lasik is relatively quick. Most patients experience improved vision within a few days and can resume normal activities shortly after surgery. However, it is essential to follow the post-operative instructions given by the surgeon to ensure proper healing.

5. How long do the effects of Lasik last?
Lasik provides long-lasting results, with most patients experiencing stable vision for many years. However, it is important to note that age-related changes in vision, such as presbyopia, may occur later in life, requiring additional corrective measures.

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In conclusion, Lasik surgery is an effective and popular method for correcting astigmatism. By reshaping the cornea, Lasik helps improve vision and reduces the reliance on glasses or contact lenses. If you are considering Lasik for astigmatism correction, consult with an experienced eye surgeon to determine if you are a suitable candidate for this procedure.

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