Understanding the Degrees and Numbers Related to Astigmatism Contact Lenses

Understanding the Degrees and Numbers Related to Astigmatism Contact Lenses

Astigmatism contact lenses are not just for changing appearance; they also serve the dual purpose of correcting vision. However, understanding the degrees and numbers involved in astigmatism contact lenses is essential when choosing the right pair. In this article, we will provide a detailed explanation of the degrees and numbers related to astigmatism contact lenses.

What Are the Types of Degrees for Astigmatism Contact Lenses?

Astigmatism contact lenses are related to key numbers such as "sphere degree (SPH)", "cylinder degree (CYL)", "axis", "base curve (BC)", "diameter (DIA)", and "graphic  diameter (GDIA)". These are fundamental numbers for correcting astigmatism and are essential for precise vision correction.

Sphere Degree (SPH)

　SPH is often represented by the letters "S," "PWR" (Power), "P," or "D" (Diopter).

    Note: Sometimes the diameter (DIA) is marked as "S" (Size).

▶For Queens Lens astigmatism contact lenses, 

you can choose from a range of 0.00 to -10.00, 

with some lenses available up to -15.00.

Cylinder Degree (CYL)

The cylinder degree (CYL) represents the degree of astigmatism. The higher the degree of astigmatism, the larger the value of the cylinder degree.

The cylinder degree typically ranges from -0.25 to -6.00 or more. For example, values such as -1.00 or -2.50 are common, and the larger the number, the stronger the astigmatism. A stronger astigmatism causes the eye's shape to become more elliptical, resulting in blurred vision, requiring specialized lenses to correct the astigmatism.

▶Queens Lens offers cylinder degrees from -0.50 to -4.50, in 0.25 steps.

Axis (Astigmatism Angle)

The axis indicates the direction of astigmatism. The axis is set within the range of 0° to 180° to correct the direction in which the astigmatism is tilted.

For example, axis values of 90° or 180° are common. This indicates whether the astigmatism is more horizontal or vertical. If the axis is at 90°, the astigmatism is stronger vertically, and if the axis is at 180°, it is stronger horizontally.

▶Queens Lens offers a wide variety of astigmatism contact lenses 

with axis values ranging from 5° to 180°.

Base Curve (BC)

Base curve refers to the curvature of the contact lens center. This number is usually measured in millimeters, typically ranging from 8.0mm to 9.0mm. Smaller values indicate a steeper curve, while larger values indicate a more gradual curve.

▶Queens Lens offers various base curve options, 

including 8.2mm, 8.4mm, 8.6mm, and 8.8mm.

Diameter (DIA)

Diameter refers to the overall size of the lens when curved. The DIA represents the transparent portion's diameter and does not affect the appearance or correction strength.

Color Diameter (GDIA)

This is the diameter of the colored part of the contact lens. While it is often written in Japanese, the alphabetic notation is GDIA.

Conclusion

Understanding the degrees and numbers associated with astigmatism contact lenses is crucial for balancing vision correction and aesthetics. By accurately understanding values such as sphere degree (SPH), cylinder degree (CYL), axis, base curve (BC), diameter (DIA), and color diameter (GDIA), you can select the contact lenses that best suit your eyes for clear and comfortable vision.

Astigmatism contact lenses are not just a fashion accessory, but an essential tool for vision correction. By using and caring for them properly, you can protect your eye health while achieving beautiful eyes.

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