Is There a Big Difference Between 1.67 and 1.74 High Index Lenses?
When shopping for high index lenses, you’ll come across two popular options: 1.67 and 1.74 high index lenses. While both serve the purpose of thinning out lenses for higher prescriptions, there are some key differences that can impact both cost and visual comfort. Here’s what to consider when deciding between these two high index options.
1.74 High Index Lenses: The Thinnest Option Available
1.74 high index lenses represent the highest index available in plastic lenses, and they’re an excellent choice if you’re aiming to minimize lens thickness for stronger prescriptions. They’re particularly beneficial for individuals with prescriptions over +/-6 or with high cylinder corrections. Additionally, if you’re drawn to larger frame styles, 1.74 lenses will help reduce the added thickness that often accompanies higher prescriptions in bigger frames.
However, it’s worth noting that this difference in thickness becomes truly noticeable in higher prescription ranges. For those with lower prescriptions, especially under -8 or +8, the thinning effect of 1.74 versus 1.67 may be minimal.
1.67 High Index Lenses: Versatile and Cost-Effective
For most prescriptions, especially those under +/-8, 1.67 high index lenses offer an ideal balance of affordability, clarity, and thinness. 1.67 lenses are slightly thicker than 1.74, but the difference is often negligible until you reach higher prescriptions. They’re also more versatile because they’re available in a wider array of lens types, such as Transitions XTRActive Polarized and other specialty coatings.
Choosing 1.67 can provide a great value for those who don’t require ultra-thin lenses but still want something thinner than standard plastic or polycarbonate. The availability of various coatings and treatments at a lower cost than 1.74 lenses makes them a popular choice.
How to Choose Between 1.67 and 1.74 High Index Lenses
- Prescription Strength: If your prescription is above +/-6 or you have high astigmatism, 1.74 lenses will be noticeably thinner.
- Frame Style: Larger frames benefit from 1.74 lenses for higher prescriptions since they help reduce peripheral thickness.
- Budget and Options: If you’re looking to save on costs or want specific treatments or lens features, 1.67 lenses are more widely available and less expensive.
Final Thoughts
While 1.74 high index lenses are the thinnest plastic option, the difference may be minimal for moderate prescriptions. For those who need the thinnest lens possible due to a high prescription or a large frame style, 1.74 is worth the investment. For others, 1.67 offers a balance of aesthetics, cost, and customization options.
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