What are the High Index Lenses? Your Easy Guide

With the increase in eye refractive errors, vision correction has also evolved significantly. People suffering from these errors now have multiple ways to treat their eye problems temporarily or permanently. One of the most common methods is using refractive lenses to see things clearly.

Individuals with strong prescriptions use bulky and thick lenses in their frames, which look less classy and uncomfortable. For such people, high-index lenses provide a sleek and modernized option with lightweight lenses.

Let us dive deeper into what high-index lenses are! We will also explore their different types, unique features, and the key factors to consider when choosing the perfect one for your needs. Let’s go!

What are High-Index Lenses?

High-index lenses are thinner and lighter than standard lenses and are designed for those with high prescriptions. They are made of material that reflects light more effectively, which is why they are thin and useful for those with strong refractive errors and heavy glasses.

How Do High Index Lenses Work?

Before you can understand the working mechanism of high-index lenses, you must have a know-how of refractive index. The refractive index is the measurement of the angle of refraction of light done by a lens. High-index lenses have a high refractive index that enables them to bend light more effectively at a wider angle.

People with myopia and hyperopia use lenses to bend light at the right angle, exactly on their retina. As their eye’s refractive error worsens, the thickness of their lenses also increases.

These massive lenses reduce the beauty of their glasses and make them tire due to the heavy weight on their faces. That’s where high-index lenses work. Due to their high refractive index, these thin lenses can bend light at a greater angle without being heavy.

Here is the number of refractive indices for multiple types of lenses.

Glass Type	Refractive Index
Standard Plastic	1.50
Polycarbonate	1.59
High Index	1.67
Ultra High Index	1.74
High Index Glass	1.80-1.90

What are the Types of High-Index Lenses?

High-index lenses come in different types to match various prescription needs. Each type is designed to help people with varying levels of refractive error. Let’s take a look.

1.67 High Index Lenses

If you have a moderate prescription, usually between +/-3.00 and +/-6.00, high-index lenses with a 1.67 refractive index will suit you. These lenses are cost-effective and fit many frame styles.

1.74 High Index Lenses

Lenses with a 1.74 refractive index are made for those with above +/-6.00 prescriptions. They are thinner than 1.67 index lenses. These lenses work well with small frames.

1.80 and 1.90 High Index Glass Lenses

These lenses are for those with very high prescriptions, often above +/-8.00. They are the thinnest available lenses and are made up of glass. These are the most fragile lenses but are a little heavier than plastic. This is why you should use a full-rim frame with these lenses for extra protection. As they are very delicate, they are not recommended for daily use.

What are the Advantages and High Index Lenses Disadvantages?

High-index lenses come with various advantages and a few disadvantages.

Advantages

• Increase the Aesthetics: As the fashion industry grows rapidly, everyone wants to look classy. That is not possible with bulky, big glasses, so high-index glasses help improve aesthetics.
• Sleek and Lightweight Designs: The high-index glasses’ slim and light structure gives them an elegant and decent look.

• Versatility: Because they are made of less material, they provide a comfortable fit. Their thin design also allows compatibility with versatile frames and allows you to choose from your favorite styles.

• Comfortable to Use: The most demanding aspect of high-index glasses that makes them a good choice is their light weight.

Disadvantages

• More Costly: High-index lenses are more expensive than standard lenses, which makes them less accessible for many people.
• Fragile: Their thin structure makes them less impact-resistant and breaks with little damage.
• Light Reflection: These lenses need anti-reflective coatings. Otherwise, they reflect light and cause a glare.

Comparing 1.67 vs 1.74 High Index Lenses: Which Is Right for You?

Patients who need high-index glasses most of the time use lenses with a refractive index of 1.67 to 1.74. A refractive index higher than 1.74 is recommended for those who are prescribed more than +/-8.

Let’s compare lenses of both refractive indexes and try to identify which one is best suited for you.

• Thickness: Lenses with a 1.74 refractive index are up to 10% thinner than 1.67 lenses, making them ideal for strong prescriptions.
• Weight: The lighter weight of 1.74 lenses enhances comfort for prolonged use.
• Cost: 1.74 lenses are typically more expensive than 1.67 lenses due to their advanced material and design.
• Durability: Both options are durable, but adding anti-scratch coatings is recommended to extend their lifespan.

For moderate prescriptions, 1.67 lenses are often sufficient. However, if you have a very high prescription and prioritize aesthetics and comfort, 1.74 lenses are the better choice.

Final Words

High-index lenses are perfect for those who are looking for light, comfortable, and more stylish eyewear. Besides comfort and aesthetics, these glasses are also highly functional for those who have worsened forms of eye refractive errors and want to get rid of their giant and heavy glasses.

However, to know which refractive index suits your eye condition, you must consult with an ophthalmologist. At Cedar Park Vision, we offer expert guidance and the best quality high-index lenses and frames to enhance your vision and comfort. Moreover, you can visit our optical shop and wall of frames to get your favorite frame.

Frequently Asked Questions

Are high-index lenses suitable for kids?

High-index glasses are not recommended for kids because they are fragile and easily breakable. Durable and strong glasses are preferred for kids.

Do high-index lenses are good for night vision?

With a protective coating, high-index glasses reduce light reflection and glare. That’s why they are good for night vision, especially for drivers who need to see clearly without the headlights of the opposite vehicle approaching.

How do I clean my high-index lenses to avoid scratches?

High-index glasses are expensive, and their scratches cannot be removed. Therefore, you should use a microfibre cloth or lens-safe cleaning solution to clean your glasses without scratches.