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1.56 High Definition ASP HMC Green Coating Optical Lens

1.56 high-definition lens is a type of lens with a refractive index of 1.56.
Usually used for correcting myopia, hyperopia, or astigmatism.

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    product details

    Data         

    Product High Definition  lens Index 1.553
    Material Resin Abbe Value 34
    Diameter 65/70 Coating HMC Green coating

    Performance

    6

    Anti-fingerprint

    5

    Waterproof

    4

    High transmittance

    3

    Wear resistance

    2

    Anti reflection

    1

    UV protection

    Lens refractive index

    HD1
    It refers to the ratio of the propagation speed of light in vacuum to the propagation speed of light in the lens material.
    It reflects the refractive power of the lens towards light.
    The higher the refractive index, the stronger the refractive power of the lens towards light.
    When choosing the refractive index of a lens, the following factors can be considered:
    Degree:
    For low myopia below 200 degrees, a refractive index of 1.50 or 1.56 can be chosen;
    For myopia between 200-400 degrees, a refractive index of 1.56 or 1.60 can be chosen;
    For myopia between 400-600 degrees, a refractive index of 1.60 or 1.67 is more suitable;
    For high myopia at 600-1000 degrees, it is recommended to choose a refractive index of 1.67 or 1.71.
    For myopia exceeding 1000 degrees, glass lenses with refractive indices of 1.71 or 1.74, or even higher, can be considered.
    HD3
    HD2
    Frame Size:
    If you choose a larger frame, in order to ensure that the edges of the lens are not too thick, you may need to choose a slightly higher refractive index.
    The relationship between the refractive index of lenses and the thickness and weight of lenses:
    Assuming all other parameters are the same, the higher the refractive index of the lens, the thinner the edge thickness of the lens, and the lighter the lens.
    HD4
    Advantages and disadvantages of different refractive indices:
    High refractive index lenses can make the lenses thinner, lighter, and more comfortable to wear.
    However, high refractive index lenses are usually more expensive and the dispersion phenomenon may be more pronounced.
    With the advancement of material technology, this law is gradually being broken,
    For example, the Abbe number of lenses with a refractive index of 1.71 is higher than that of most lenses with a refractive index of 1.56 and 1.67.

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