What does the Lenses Index numbers mean?
The lens index number refers to the refractive index of the lens material, which indicates how efficiently the lens bends light. A higher lens index means that the lens can bend light more effectively, allowing for thinner and lighter lenses. Here’s a breakdown of what the different lens index numbers mean:
- Standard Index (1.50):
- Description: Standard plastic lenses with a refractive index of 1.50 are the most common and affordable option. They are suitable for low to moderate prescriptions but may become thicker and heavier for stronger prescriptions.
- Best For: Mild prescriptions and larger frame sizes where lens thickness is less of a concern.
- Mid-Index (1.56 - 1.60):
- Description: Mid-index lenses are thinner and lighter than standard lenses, making them a good option for moderate prescriptions. They offer a balance between thickness and affordability.
- Best For: Moderate prescriptions, especially if you prefer a thinner lens.
- High-Index (1.67):
- Description: High-index lenses with a refractive index of 1.67 are significantly thinner and lighter than standard lenses. They are ideal for stronger prescriptions, reducing the "coke bottle" effect often seen with thick lenses.
- Best For: Stronger prescriptions where lens thickness and weight are a concern.
- Ultra-High Index (1.74):
- Description: Ultra-high index lenses with a refractive index of 1.74 are the thinnest and lightest lenses available. They provide maximum reduction in lens thickness and weight, making them ideal for very strong prescriptions.
- Best For: Very strong prescriptions, offering the most cosmetic and comfort benefits by minimizing lens thickness.
Benefits of Choosing a Higher Index Lens:
- Thinner Lenses: As the index number increases, the lenses become thinner and lighter, which is especially beneficial for those with strong prescriptions.
- Improved Comfort: Higher index lenses reduce the weight of the glasses, making them more comfortable to wear for extended periods.
- Aesthetics: Higher index lenses minimize the "coke bottle" effect, providing a sleeker and more attractive appearance, especially in smaller or rimless frames.
When selecting the right lens index for your needs, consider your prescription strength and preferences for lens thickness and weight. If you’re unsure which lens index is best for you, our customer service team is here to help guide you through the selection process!
