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A high-index 1.67 lens is a spectacle lens material with a refractive index of 1.67. This material is thinner and lighter than both standard plastic (1.50) and 1.60 index lenses. It is commonly used for wearers with medium-high to high prescriptions.
read more about high index 167 eyeglass lens ...The main benefit is significant thinness. Lenses made in the 1.67 index are approximately 30 percent thinner than standard plastic lenses. This reduction drastically improves the cosmetic appearance of thick prescription lenses by reducing edge thickness.
The 1.67 index is highly beneficial for people with prescriptions ranging from -4.00 to -8.00 diopters. For these stronger prescriptions, the 1.67 index reduces the unflattering edge thickness that standard plastic lenses would create, minimizing the "coke bottle" look.
The 1.67 index is strong and durable. It meets minimum safety standards, making sure the lens resists cracking and is safe for daily wear, even though it is very thin. It is often preferred for use in semi-rimless frames.
Due to its high ability to bend light, 1.67 material must be paired with an anti-reflective (AR) coating to maximize clarity. Without AR coating, the lens reflects about 7% of light, causing distracting internal glare. With AR coating, clarity is excellent.
Yes, 1.67 index lenses are durable enough for use in rimless frames, but the drill holes must be made carefully by the technician.
No, the material is clear. It provides excellent optical clarity but should always be paired with an anti-reflective coating.
They are significantly lighter than standard plastic, often reducing the overall weight of the spectacles by 25 to 30 percent.
If you have a strong prescription and suffer from "nose bridge pressure" or chronic marks on your nose, 1.67 lenses are a medical necessity to reduce physical weight. This helps prevent skin irritation and tension headaches caused by heavy frames.
Consumer Reports. Eyeglass Lens Guide (consumerreports.org). 2024.
Review of Optometry. High-Index Dispensing Challenges (reviewofoptometry.com). 2024.
The Vision Council. Laboratory Processing Standards (thevisioncouncil.org). 2023.
AAO. Selecting Comfortable Eyewear (aao.org). 2024.