Understanding the Difference: 1.61 vs 1.67 High Index Lenses

In this blog post, we delve into the world of high index lenses and explore the differences between two popular options: 1.61 and 1.67 index lenses. We start by explaining what high index lenses are and why they are a preferred choice for individuals with strong prescriptions. We then compare the two types, discussing their characteristics, benefits, and drawbacks. We cover factors such as thickness, weight, clarity, and cost, shedding light on how these aspects differ between 1.61 and 1.67 lenses. By the article’s close, you’ll be well-equipped to distinguish between these high index lens options, aiding you in making an informed decision tailored to your visual requirements.

What are High Index Lenses?

High index lenses are a type of eyeglass lens that is designed to be thinner and lighter than traditional lenses. They are made using advanced materials that have a higher index of refraction. This means that they can bend light more efficiently, allowing for a reduction in lens thickness and weight.

Differences between 1.61 and 1.67 High Index Lenses

  • Material Composition 1.61 and 1.67 high index lenses share their material composition. 1.61 lenses and 1.67 lenses are made of a material called MR-8, which is a type of high index plastic that offers excellent optical performance.
  • Index of Refraction Another significant difference between these two types of lenses is their index of refraction. 1.61 lenses have an index of refraction of 1.61, while 1.67 lenses have an index of refraction of 1.67. The higher the index of refraction, the more efficiently the lens can bend light, resulting in thinner and lighter lenses.
  • Optical Performance>When it comes to optical performance, both 1.61  and 1.67  lenses offer excellent clarity and visual acuity. However, the 1.61 lens ranks slightly higher than the 1.67 when it comes to optical clarity.
  • Thickness and Weight The most notable difference between 1.61 and 1.67 high index lenses is their thickness and weight. 1.67 lenses are generally thinner and lighter than 1.61 lenses. This makes them a more suitable choice for individuals with higher prescriptions who are looking for the most aesthetically pleasing and comfortable eyewear.

Factors to Consider when Choosing between 1.61 and 1.67 High Index Lenses

  • Preset Prescription Strength The prescription strength plays a crucial role in determining whether to choose 1.61 or 1.67 high index lenses. For individuals with stronger prescriptions, 1.67 lenses are often recommended due to their ability to provide thinner and lighter lenses.
  • Frame Selection; Another factor to consider is the frame selection. Some frame styles may not be suitable for certain lens thicknesses. Thinner wire frames would be better suited for the thinnest lens option as more of the lens itself will be visible, whereas a thicker plastic frame will hide more of the lens edge thickness so you may not need a thinner lens depending on your prescription.
  • Budget Cost is another factor to consider when choosing between 1.61 and 1.67 high index lenses. Generally, 1.67 lenses tend to be more expensive than 1.61 lenses due to their higher index of refraction.
  • Aesthetic Preferences Personal aesthetic preferences also come into play. Some individuals may prioritize the thinnest and lightest lenses possible, while others may prioritize other factors such as cost, optical clarity, or frame compatibility.

Related: Lens Index & Material Guide

Pros and Cons of 1.61 High Index Lenses


  • Thinner and lighter than traditional lenses
  • Offer good optical performance
  • More budget-friendly compared to 1.67 lenses


  • Not as thin or lightweight as 1.67 lenses
  • May not be suitable for individuals with stronger prescriptions

Pros and Cons of 1.67 High Index Lenses


  • Thinner and lighter than 1.61 lenses
  • Suitable for individuals with stronger prescriptions
  • Aesthetically pleasing


  • Higher cost compared to 1.61 lenses
  • May not be suitable for all frame styles

When it comes to choosing between 1.61 and 1.67 high index lenses, there are various factors to consider. The decision ultimately depends on the individual’s prescription strength, frame selection, budget, aesthetic preferences, and lifestyle. Both types of lenses offer their own set of advantages and disadvantages, and it is important to weigh these factors carefully before making a decision. By understanding the differences between 1.61 and 1.67 high index lenses, individuals can make an informed choice when selecting the most suitable lenses for their needs.

About the Author: Dr. Steven Lee

Dr. Steven Lee is a visionary leader in the eye care and telemedicine sectors and has built a remarkable career by combining his formal training in eye care, engineering expertise, and a passion for innovation. Dr. Lee serves as Zenni’s the Head of Optical Product.