Index Number: 167 2025

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High-index lenses have a refractive index above 1.50 ranging from 1.53 to 1.74. The image below compares the lens thickness of a regular plastic lens (1.50) to the most commonly prescribed high-index lenses. Note: The higher the refractive index, the thinner the lens.
Solution: The factors of 167 are 1, 167. Therefore, 167 has 2 factors.
: a number used to indicate change in magnitude (as of cost or price) as compared with the magnitude at some specified time usually taken as 100.
Now lets talk numbers: what h-index is considered good? ing to Hirsch, a person with 20 years of research experience with an h-index of 20 is considered good, 40 is great, and 60 is remarkable.
Anything over a refractive index (how well the material bends light) of 1.52 is considered a high-index lens: CR39 (standard) plastic 1.50. Crown (standard) glass 1.52. Trivex 1.53.
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The term high-index refers to the refractive index of a lens. The refractive index is a measure of the lenss ability to bend light: The higher the refractive index, the more efficient the lens is at bending light and correcting vision. High-index lenses are therefore quite powerful.
1.61 lenses are ideal for mild prescriptions under +/- 2.00. 1.67 lenses suit prescriptions between +/- 2.00 to +/- 5.00. 1.74 lenses cater to very high prescriptions over +/- 5.00.
Index (indices) in Maths is the power or exponent which is raised to a number or a variable. For example, in number 24, 4 is the index of 2. The plural form of index is indices.

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