Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1997-09-10
1999-11-02
Epps, Georgia
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351 44, 359722, G02C 710
Patent
active
059756950
ABSTRACT:
An optical element is disclosed comprising an upper portion (9) and a lower portion (8) defined in opposite parts with respect to a median line (x--x) passing through the geometric center (C.sub.1, C.sub.2) of the optical element, wherein the factor of luminous transmittance is between 30% and 80% in the lower portion (8) and between 3% and 40% in the upper portion (9). Advantageously, furthermore, the curve of spectral transmittance as a function of the wavelength in the lower portion (8) and at a distance of at least 10 mm from the median line (x--x) is such as to show: a minimum in a wavelength range of from 495 to 510 nm, ii) an increase in spectral transmittance at wavelengths lower than 495 nm and higher than 510 nm, iii) a maximum at a wavelength lower than 440 nm, iv) a reduction in the spectral transmittance as the wavelength decreases starting from said maximum.
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Baiocchi Paolo
Iori Giuseppe
Marusi Graziano
Epps Georgia
Intercast Europe S.p.A.
Schwartz Jordan M.
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