Importance of Contact Lens Diameter and Edge Design

When it comes to wearing contact lenses, the diameter and edge design play a crucial role in both comfort and vision correction. Let's explore these two essential elements.

📏 1. Contact Lens Diameter

The diameter of the lens is a key factor in ensuring that the lens fits securely on the eye. Choosing the right diameter helps the lens stay stable without excessive movement. However, an incorrect diameter can cause discomfort or frequent lens movement, leading to vision issues.

✨ 2. Edge Design

The edge design significantly impacts the comfort of the lens. It ensures that the lens fits well on the eye and improves the interaction between the lens and the eyelid.

1. Edge Thickness

   • A thick edge can cause the lens to move excessively, leading to discomfort.
   • Conversely, a too-thin edge can feel sharp, causing irritation every time you blink.

2. Ideal Edge Shape

   • The ideal edge tapers naturally and is softly finished, reducing irritation and preventing the corneal epithelium from drying out.

🛠 3. Types of Lenticular Design

Lenticular designs are mainly divided into Plus Lenticular Design and Minus Lenticular Design. Each design is tailored to optimize lens comfort according to specific prescriptions.

1. Plus Lenticular Design

   • Also known as Hyperflange, this design is commonly used for myopic lenses above 5.0D. It prevents the lens from shifting upwards and allows smooth movement under the upper eyelid, improving overall comfort.

2. Minus Lenticular Design

   • Known as Myoflange, this design is used for hyperopic lenses and myopic lenses below 1.50D. It thickens the thin edge to prevent the lens from drooping and enhances centration.

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