Astigmatism is a common vision condition that can impact quality of life and daily activities, especially as it progresses. Many people wonder at what level of severity astigmatism requires correction with glasses or contact lenses. This article explains the different levels of astigmatism, its causes, symptoms, effects on daily life, and how to select the best corrective options.
Levels of Astigmatism Severity
Understanding the severity of astigmatism is crucial in determining whether glasses or contact lenses are necessary. Astigmatism is typically divided into three main levels:
Mild Astigmatism (Less than 1.00 Diopter)
At this level, visual distortion is minimal, and most people with mild astigmatism may not notice any significant impact on their vision. However, if symptoms like eye strain or occasional blurriness arise, wearing glasses can improve comfort.
Moderate Astigmatism (1.00–2.00 Diopters)
At this level, vision becomes noticeably blurred or distorted, especially when focusing on objects at a distance or close-up for extended periods. Glasses or contact lenses specifically designed for astigmatism can significantly improve clarity and reduce eye strain.
Severe Astigmatism (More than 2.00 Diopters)
Severe astigmatism causes a major impact on vision, including frequent blurriness and distortion, and may require squinting or tilting the head to focus. Glasses or toric contact lenses specially designed for astigmatism are essential for clear vision. For those seeking a permanent solution, LASIK surgery is also an option to reshape the cornea.
Causes and Symptoms of Astigmatism
Astigmatism is caused by an irregular shape of the cornea or lens, which prevents light from focusing on a single point on the retina. This irregularity may be present from birth due to genetics or develop as a result of an eye injury or surgery.
Symptoms of Astigmatism
- Blurred or distorted vision
- Eye strain and discomfort
- Squinting or tilting the head to see clearly
- Headaches, particularly after focusing on something for an extended period
Diagnosing Astigmatism
Accurate diagnosis of astigmatism requires an eye examination by an eye specialist. Specific instruments like a keratometer measure the curvature of the cornea, providing values for “Cylinder” (CYL), which indicates the level of distortion, and “Axis,” which shows the direction of astigmatism. These values help determine the severity of astigmatism and guide the choice of appropriate corrective lenses.
Selecting the Right Corrective Lenses for Astigmatism
-
Glasses
Glasses with cylindrical lenses help correct the distortion caused by astigmatism, providing clearer vision and reducing eye strain. They are a convenient choice for general use in daily life. -
Toric Contact Lenses
Toric lenses are specially designed to stay stable on the eye, delivering consistent and clear vision even while blinking. These lenses are ideal for those who prefer not to wear glasses or have an active lifestyle. -
LASIK Surgery
LASIK is a permanent corrective option for those who want freedom from lenses. This surgery reshapes the cornea, reducing or eliminating astigmatism and is especially effective for moderate to severe cases.
Eye Care Tips for People with Astigmatism
- Take Frequent Breaks: Use the 20-20-20 rule: every 20 minutes, look at something 20 feet away for at least 20 seconds to reduce eye strain.
- Use Proper Lighting: Ensure adequate lighting when reading or working to prevent eye fatigue.
- Schedule Regular Eye Exams: Yearly eye exams help monitor changes in astigmatism and receive updated recommendations from an eye specialist.
Frequently Asked Questions (FAQs)
1. Can astigmatism go away on its own?
Astigmatism usually does not resolve on its own, as it’s related to the physical structure of the eye. Correction typically involves glasses, contact lenses, or laser surgery.
2. Are contact lenses or glasses better for astigmatism?
Both options are effective, but it depends on personal preference. Toric contact lenses may be more convenient for those with an active lifestyle, while glasses are often easier to care for.
3. Is LASIK safe for correcting astigmatism?
Yes, LASIK is safe and effective for moderate to severe astigmatism. However, a consultation with an eye specialist is necessary to determine if it’s a suitable option.
4. How often should I get my eyes checked if I have astigmatism?
Annual eye exams are recommended, or more frequently if you notice changes in vision, such as increased blurriness or headaches.
5. Can children have astigmatism?
Yes, children can have astigmatism, and early correction can support their learning and development. Glasses are typically recommended to ensure clear vision and prevent eye strain.
