| 摘要 |
Progressive, multifocal ophthalmic lens, characterized by the fact of having more optical areas among which the dioptric progression one is made of an optical material having a variable refraction index so that this progression area starting by an end having the refraction index value of the material forming the lens in the far sight area progressively reaches at the other end the refraction index of the material forming the lens in the near sight area, thus obtaining, when the lens surface is shaped according to monofocal curves, the following three optical areas: an optical area (a) having dioptric value for far sight, an optical area (c) having dioptric value for near sight, an optical progression area (b), placed between the far sight and the near sight, in which progression area the dioptric value changes from the far sight value to the near sight value owing to the continuous variation of the refractive index.
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