Calcolo dell'apertura numerica in ottica - Formulas Today - apertura numerica
Lens thickness plays a critical role in both vision correction and aesthetics. Thicker lenses can cause distortion, magnification, or minification of the wearer's eyes, which can be a cosmetic concern. Thinner lenses, especially for people with high prescriptions, provide a more comfortable and visually appealing option. Knowing the edge thickness helps optometrists and lens manufacturers design lenses that balance functionality, comfort, and appearance.
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The calculation of lens thickness is a crucial factor in optometry and lens manufacturing. Thicker lenses tend to distort vision more than thinner ones and are often less aesthetically pleasing. With the development of high-index lenses (higher refractive index), it became possible to design thinner lenses for the same optical power, improving both visual clarity and user comfort.
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\[ \text{Edge Thickness} = \text{Center Thickness} - \frac{\text{Lens Power} \times \text{Lens Diameter}^2}{2000 \times (\text{Refractive Index} - 1)} \]
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\[ \text{Edge Thickness} = 2 - \frac{-5 \times 65^2}{2000 \times (1.6 - 1)} = 2 - \frac{-21125}{1200} = 2 + 17.6 = 19.6 \text{ mm} \]
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