What Lens Index Is Best For You?
Knowing The Difference Between 1.50 And 1.74
When you’re looking to purchase your next pair of eyeglasses, you might come across the term “lens index.” Also known as the “index of refraction” or the “refractive index,” this number is a measurement of how efficiently lens material bends light. Understanding these numbers and how they relate to your eyesight is an important part of choosing the right lenses for you.
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Table Of Contents
- What does lens index mean?
- 1.50 Standard Index
- 1.56 Mid-Index
- 1.59 Polycarbonate
- 1.61 High Index
- 1.67 High Index
- 1.74 High Index
- What other factors should I consider when choosing my lens index?
Recommended lens index
Lens index | Features | SPH | CYL | |
---|---|---|---|---|
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1.5 INDEX LENS | Conventional single-vision lenses. Available starting from $0. | + 2.25 to -2.25 | +/- 2.00 or below |
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1.57 INDEX LENS | For people with moderately-strong prescriptions. Thinner and lighter than standard lenses. | -2.50 to -5.00 or +2.50 to +5.00 |
+/- 3.00 or below |
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1.59 INDEX LENS | Made with premium polycarbonate. Features 100% UV protection. Durable and impact-resistant. | -4.25 to -6.75 or +4.25 to +6.75 |
-2.25 to -3.00 or +2.25 to +3.00 |
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1.6 INDEX LENS | Stylish and extra-thin. Great choice for stronger prescriptions. | -4.25 to -6.75 or +4.25 to +6.75 |
-2.25 to -3.00 or +2.25 to +3.00 |
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1.67 INDEX LENS | Extremely thin. Good choice for extra-strong prescriptions. | -7.00 to -9.00 or +7.00 to +9.00 |
-3.25 to -4.00 or +3.25 to +4.00 |
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1.74 INDEX LENS | As thin as possible Best for the highest prescriptions. | +/-9.25 and above | -4.25 to -6.00 or +4.25 to +6.00 |