Key Considerations for Astigmatism and Toric Contact Lenses

Your sister has been diagnosed with astigmatism, a condition where the shape of the eye is slightly oval or football-shaped, leading to distorted vision. Since one of her eyes has an axis of 10 and the other has an axis of 15, she is considering toric contact lenses as a solution. However, the available choices for the axis are either 10 or 20. In this article, we will explore the details and considerations involved in choosing the right toric lenses for your sister.

What Is the Power of the Astigmatism Correction?

When it comes to astigmatism, the correction power depends on the specific levels of the axis and the diopter strength. Small amounts of astigmatism, such as 1.00D or less, can often be managed with regular soft contact lenses. In such cases, the need for toric lenses is less critical as the soft lenses may provide adequate vision correction. However, if her vision is still not satisfactory, she may need toric lenses, which are specifically designed to correct astigmatism.

Understanding Astigmatism and Its Nomenclature

Astigmatism occurs when the shape of the eye is not perfectly round. This can be visualized with an oval magnifying glass, where the curve is steeper in one direction and less steep in another. Astigmatism is described optically in one of two ways: either by quoting the weaker long axis and the difference added, or by listing both the strengths directly. For example, a prescription of 5.00 2.00 x 180 can also be written as 7.00 -2.00 x 90. A perfect, round eye has a prescription of 0.00, and any deviation from this is considered astigmatism.

Choosing the Right Toric Lenses

When fitting toric lenses, careful consideration is required. Each pair may rotate differently, and the thickness of the lenses can vary, leading to different fitting experiences. It is not advisable to guess and waste money buying multiple prescriptions until the right one is found. Doing it right the first time is crucial for both saving money and protecting your sister's eye health.

Why Get the First Prescription Right?

It is essential to have the first prescription of toric lenses fitted correctly. Although online refills can be an option for subsequent replacements, the initial fitting is critical. The eye doctor will need to assess the fit and adjust the lenses if necessary. The goal is to ensure that the lenses provide clear, comfortable vision and do not cause any irritation or discomfort.

In Conclusion

The decision to choose toric lenses for your sister should be guided by her eye doctor, as they have the necessary expertise and experience. While small amounts of astigmatism may not require correction, higher levels often necessitate toric lenses. Understanding the nomenclature of astigmatism and the intricacies of fitting toric lenses will help your sister make an informed decision. It is vital to get the first prescription correct to avoid any unnecessary complications. By following the guidance of her eye doctor and being patient, your sister can achieve optimal vision and comfort with her toric lenses.