High Index Glasses

Frequently Asked Questions

High-index lens material refers to a type of optical material used to make lenses with a higher refractive index than standard lens materials. The refractive index determines how much a lens can bend or refract light. High-index lenses bend the light more efficiently, allowing for thinner and lighter lens profiles.
Traditionally, standard plastic or CR-39 lenses have a refractive index of 1.49. In contrast, high-index lenses have a refractive index that typically ranges from 1.60 to 1.74 or higher, depending on the specific material.
The higher refractive index of high-index lens materials allows them to bend light more effectively, reducing the material needed to correct vision and resulting in thinner and lighter lenses. This is particularly advantageous for individuals with stronger prescriptions, as it helps eliminate the bulkiness and weight often associated with thicker lenses.
High-index lens materials are available in various types, including plastics and glass. Each material has unique properties and benefits regarding lens thickness, weight, clarity, and impact resistance.

High-index lenses offer several advantages for individuals with specific vision needs, but there are also a few considerations or trade-offs to consider. Here are the plus and minus points of high-index lenses:

Advantages of High-Index Lenses:

  1. Thinner and Lighter: High-index lenses are significantly thinner and lighter than standard lenses for people with high prescriptions, making them more comfortable to wear, especially for individuals with higher prescriptions. The reduced thickness also provides a more aesthetically pleasing appearance, reducing the distortion commonly associated with thicker lenses.
  2. Improved Cosmetics: High-index lenses offer better cosmetic appeal, as they minimize the “bug-eye” effect that can occur with thicker lenses. They provide a more natural look, allowing individuals with strong prescriptions to wear fashionable frames without the lenses appearing overly thick or protruding.
  3. Clearer Vision: Despite their reduced thickness, high-index lenses maintain excellent optical properties and can effectively correct refractive errors. They provide clear, sharp vision, minimizing distortions and aberrations for individuals with high prescriptions.

Considerations of High-Index Lenses:

  1. Cost: High-index lenses are more expensive than standard lenses due to their advanced optical properties and manufacturing processes. The increased cost is something to consider when comparing different lens options.
  2. Reflective Glare: Some high-index lenses, especially those with higher refractive indices, have more potential for reflective glare than standard lenses. 
  3. Availability: Depending on the specific lens material and prescription, high-index lenses may be limited in particular lens options, such as tints, transitions, or coatings. It’s essential to verify the availability of desired features when considering high-index lenses.

There are several reasons why you may want to consider high-index Glasses:

  1. Thinner and Lighter: High-index lenses are significantly thinner and lighter than standard lenses. This is particularly beneficial if you have a strong prescription. Thinner lenses provide a more attractive and natural appearance, reducing the “bug-eye” or “small-eye” effect that can occur with thicker lenses. The lighter weight also enhances comfort, with less pressure on your nose and ears.
  2. Improved Aesthetics: High-index lenses offer a sleeker profile, making them more aesthetically appealing. If you prefer thinner, more stylish frames, high-index lenses can complement your chosen eyewear, allowing you to showcase your style.
  3. Enhanced Comfort: High-index lenses’ reduced thickness and weight contribute to increased comfort during prolonged wear. This is particularly advantageous if you wear glasses for extended periods or engage in activities requiring lightweight eyewear.
  4. Clearer Vision: High-index lenses exhibit excellent optical properties, minimizing distortions and delivering clearer vision. These lenses can provide sharper visual acuity, especially for wearers with higher prescriptions.
  5. Compatibility with Various Frames: High-index lenses are versatile and compatible with various frame styles, including curved or wraparound designs. This flexibility opens up more options when selecting fashionable frames that suit your preferences.
  6. Scratch Resistance: Many high-index lens materials possess inherent scratch-resistant properties. This means they are more durable and less prone to damage from everyday wear and tear, resulting in longer-lasting lenses.

It’s important to note that the lens index choice depends on your prescription and lifestyle needs. 

The most popular high-index lens material is 1.67. There are a few reasons for its popularity:

  1. Reasonable Cost: 1.67 high-index lenses offer a good balance between thinness, weight reduction, and cost. They are generally more affordable compared to higher index options like 1.70 or 1.74 lenses, making them accessible to a more significant number of individuals.
  2. Wide Range of Lens Options: 1.67 high-index lenses have a wide availability of lens options. This means you can choose from various lens treatments, coatings, and tints to customize your eyewear based on your specific needs and preferences. The extensive range of options allows for greater flexibility in lens selection.
  3. Manufacturing Ease: 1.67 high-index lenses are relatively easier to manufacture than lenses with higher refractive indices like 1.70 or 1.74. The manufacturing process for 1.67 lenses is more streamlined and efficient, resulting in faster production times and lower costs.

Overall, the combination of reasonable cost, extensive lens options, and ease of manufacturing makes 1.67 high-index lenses the most popular choice among individuals seeking thinner and lighter lenses.

An anti-reflective (AR) coating on your high-index glasses is highly recommended and can offer several benefits. Here are some reasons why you should consider adding an anti-reflective coating to your high-index lenses:

  1. Reduction of Glare: High-index lenses tend to have a higher refractive index, which can increase the potential for glare and reflections. An anti-reflective coating helps minimize these reflections, reducing glare from artificial lighting, computer screens, and headlights while driving. Anti Reflective coating improves visual comfort and clarity, especially when exposed to harsh light sources.
  2. Improved Visual Acuity: The anti-reflective coating allows more light to pass through the lens, increasing the light reaching your eyes. This can enhance overall visual acuity, particularly in low-light conditions, by reducing light scatter and increasing contrast sensitivity.
  3. Enhanced Cosmetics: Anti-reflective coatings virtually eliminate reflections on the lens surfaces, making your high-index glasses more aesthetically appealing. With reduced reflections, others can see your eyes more clearly behind the lenses, providing a more natural and less distracting appearance.

It’s important to note that while an anti-reflective coating offers numerous benefits, it may add to the cost of your lenses. However, many people find the improved visual comfort, clarity, and aesthetics the coating provides well worth the investment.

High-index lenses have advantages, but it’s essential to consider their suitability for your prescription. Here’s a simplified explanation:
If you have a high prescription, high-index lenses can be a game-changer. Their advanced technology allows for significantly thinner and lighter lenses, eliminating traditional lenses’ bulky and heavy feel. You’ll love how they enhance your appearance and provide a more comfortable wearing experience. Say goodbye to the days of thick, unflattering lenses and hello to a sleek and stylish look that matches your unique personality.

However, high-index lenses’ benefits may be nothing if you have a standard prescription. Standard lenses can correct your vision without the need for high-index lenses. Ordinary lenses can be just as good, if not better, at a fraction of the cost.

Yes, there is a noticeable difference in thickness between 1.67 and 1.74 high-index lenses. When referring to lens thickness, these numbers represent the index of refraction for the lens material. A higher index of refraction allows lenses to be thinner for the same prescription power.
Generally, the higher the index of the lenses, the thinner the lenses will be. Therefore, 1.74 high-index lenses are thinner than 1.67 high-index lenses.

The difference in thickness between 1.67 and 1.74 index lenses for a -8.00 prescription will vary based on the specific lens design and frame choice. However, as a general guideline, the difference in thickness can be estimated to be around 10-15% or more.
Please note that these figures are approximate and vary depending on lens design and frame size.

The difference in thickness between these two indices may not be significant in all cases. The improvement in thickness becomes more noticeable with higher prescription powers. If you have a mild prescription, the difference between 1.67 and 1.74 lenses may not be as dramatic.

Yes, we do offer high-index transition lenses. We provide the Transition Signature Series and Transition Xtractive lenses in grey and brown tints. These lenses are available in the 1.67 index, which offers excellent thinness and lightness while providing transition functionality. We also offer Transition Signature lenses in the 1.74 index, ensuring optimal visual performance for those with stronger prescriptions. The grey and brown tints provide versatile options to suit different preferences and complement various frame styles. Feel free to explore our range of high-index transition lenses and choose the one that best suits your needs.

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