What is Regular vs Irregular Astigmatism

Regular vs. Irregular Astigmatism

Astigmatism is a common vision condition that occurs when the eye is unable to focus light evenly on the retina. As a result, images may appear blurry or distorted. Astigmatism can be classified as either regular or irregular. Regular astigmatism occurs when the cornea is curved equally in all directions. Irregular astigmatism, on the other hand, occurs when the cornea is curved more in one direction than another. This type of astigmatism is often caused by an injury or surgery to the eye. LASIK surgery is a common treatment for both regular and irregular astigmatism. During this procedure, a laser is used to reshape the cornea and allow light to enter the eye evenly. This can help to improve vision and reduce or eliminate astigmatism symptoms.

1. What Is Regular Astigmatism?

With regular astigmatism, the curvature of your eye is not completely round. This type can cause blurry vision in both near and far objects because it distorts them by making one more curved than another – think football-shaped versus basketball shaped. The distortion makes objects from near to far appear blurry or stretched.

2. What Is Irregular Astigmatism?

Irregular astigmatism is similar to regular astigmatism in that the curvature of the eye’s surface is not perfectly round, but where it differs is that instead of the curvature being evenly shaped (mostly in one direction), it is uneven, or curved in multiple directions. For example, it could be steeper towards the bottom and less so towards the top. It could even have multiple configurations. With irregular astigmatism, it is more difficult to describe how uneven the eye is shaped.

Regular vs. Irregular Astigmatism: Types

1. Regular Astigmatism –

Regular astigmatism is further classified into three types that include with-the-rule, against-the-rule, and oblique astigmatism.
With-the-rule astigmatism is where the vertical meridian is the steepest and it stays close to 90˚. This is mostly common in children.

In against-the-rule astigmatism, the horizontal meridian stays close to 180˚, which is steeper than the vertical meridian.
Against-the-rule astigmatism is common in the elderly.

Thirdly, oblique astigmatism is diagnosed if the expected meridians aren’t at 90˚ or 180˚. Here, the shape of the eyeball resembles a tilted American football, with its prime meridians lying between 30˚–60˚ and 120˚–150˚.

2. Irregular Astigmatism –

There are two types of irregular astigmatism that include macro-irregular and micro-irregular astigmatisms.

Macro-irregular astigmatism – The primary cause of this type of astigmatism is the formation of a steep or flat area that is at least 2 mm in diameter.

Micro-irregular astigmatism – This happens when multiple irregularities come together, which can be big, small, steep, or flat. Calculations using profile maps are very difficult in such conditions.

Regular vs. Irregular Astigmatism: How Is Astigmatism Treated?

Regular Astigmatism –

Standard ophthalmic lenses are widely used in correcting regular astigmatism. Soft or rigid gas permeable (RGP) spherical contact lenses are the best to correct astigmatism that shows lower sphere refractive error than 1/3. Contact lenses and surgical procedures are the other methods that can be used in the correction process. Visual acuity will be better when using RGP lenses as compared to soft contact lenses for patients with regular astigmatism.

Irregular Astigmatism –

It is difficult to correct irregular astigmatism with standard spectacles, as this cannot provide actual visual acuity and the images seen will be blurred in nature. Obliquely crossed cylinders and other surgical techniques are being proposed in such cases.
Visual acuity cannot achieve perfection even in the best available treatments regarding irregular astigmatism. To improve this condition, the use of contact lenses is an alternative approach.

Regular vs. Irregular Astigmatism: Related FAQs

Q1. How do I know if I have irregular astigmatism?

It is the most common type of astigmatism in which the symptoms included are blurry vision, headaches, and light sensitivity, to name a few.

Q2. How do I fix irregular astigmatism?

Irregular astigmatism cannot be fully corrected with glasses, and sometimes not with soft contact lenses. Rigid gas permeable lenses are the best modality to correct irregular astigmatisms. Sometimes surgery can also be taken into account.

Q3. How Do I Correct Regular and Irregular Astigmatism?

H2: Summary
Astigmatism is a common vision problem caused by an error in the shape of the cornea. The two main types of astigmatism are regular or irregular. A regular astigmatism occurs when the eye isn’t completely curved. An irregular astigmatism, which is less common, also occurs when the eye isn’t completely round. But unlike a regular astigmatism, where the eye is evenly misshaped. Treatments for both include glasses and lenses. The severity of the refractive error describes the treatment options.

Astigmatism can cause a lot of distress in day to day life. Correction and treatment of the refractive error is the only way. Experiencing symptoms of Astigmatism? Get in touch with us today.

What Does LASIK Do for Astigmatism?

Astigmatism is a very common condition, and it often occurs in combination with other refractive errors, such as nearsightedness or farsightedness. LASIK surgery is a popular treatment for astigmatism. The goal of LASIK surgery is to correct the corneal curvature and allow light to focus directly on the retina. This can provide patients with a clear vision and reduced dependence on glasses or contact lenses. LASIK surgery is usually safe and effective, and most patients experience significant improvements in their vision following treatment.

Who is a Candidate for LASIK for Astigmatism?

For many people, astigmatism can be corrected with glasses or contact lenses. However, these methods can be inconvenient and expensive. LASIK surgery is a more permanent solution for Astigmatism.

To be a candidate for LASIK surgery, you must:

  • Be over 18 years old
  • Have had a stable eyeglass or contact lens prescription for at least two years
  • Not have any other serious eye diseases
  • Have healthy corneas
  • Have realistic expectations about the results of surgery

What to Expect With LASIK for Astigmatism

LASIK surgery is a type of refractive surgery that corrects astigmatism by reshaping the cornea. The surgeon uses a laser to create a small flap in the cornea and then uses the laser to remove a small amount of tissue from underneath the flap. This reshapes the cornea so that it becomes more evenly curved. The flap is then put back in place and allowed to heal. LASIK surgery is usually performed on an outpatient basis and takes less than 30 minutes to complete. Most people experience significant improvements in their vision after LASIK surgery and do not require glasses or contact lenses for regular activities.

Success Rates of LASIK

Astigmatism is a common refractive error that affects millions of people worldwide. Many people with astigmatism choose to correct their vision with LASIK surgery, which involves reshaping the cornea to improve vision. LASIK surgery can correct Astigmatism in up to 98% of patients and the result of the surgery is as good as a 20/20 vision correction. For many people, LASIK surgery can mean a life without glasses or contact lenses.

Costs of LASIK Surgery for Astigmatism

The surgery involves using a laser to modify the shape of the cornea. In most cases, LASIK surgery is successful in improving vision. The cost of LASIK surgery can vary depending on a number of factors, including the type of procedure, the surgeon’s experience, and the geographic location. In India, the average cost of LASIK surgery for astigmatism is between Rs. 10,000 and Rs. 20,000. This cost can be covered by insurance in some cases.

Recovery After Astigmatism Correction With LASIK

Most people who have the surgery experience little to no pain and recover quickly. Side effects are usually minor and temporary. Recovery after LASIK surgery typically takes a few days, but most people experience significant improvement in their vision within a day or two after the surgery. The surgeon might suggest wearing special glasses.

Lasik for Astigmatism: Related FAQs

Q1. Can LASIK treat astigmatism?

Yes, LASIK surgery treats astigmatism and other refractive errors of the eye.

Q2. How long does LASIK last when used to treat astigmatism?

LASIK treats Astigmatism for good. The surgery is a refractive one and patients see vision clearance in a day’s time post-surgery.

Q3. Is LASIK worth it if you have astigmatism?

Yes, LASIK is successful in treating most people’s astigmatism, as long as it’s the right type and it falls within the treatment limits. With the technology used in our practice, we are typically able to treat patients who have high levels of astigmatism.


LASIK surgery is a procedure that uses a laser to reshape your cornea to correct refractive eye conditions. It is usually safe and effective, and most patients experience significant improvements in their vision following treatment. For many people, astigmatism can be corrected with glasses or contact lenses. LASIK surgery is a more permanent solution for Astigmatism. It’s important to note that each patient is unique, and your doctor will ultimately determine if you really require a good candidate for the procedure. If you’ve been considering LASIK surgery but have questions about what to expect, talk to your eye specialist for more information.

LASIK surgery can fix blurry vision. For more information on LASIK surgery or eye health, get in touch with us!

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