Ophthalmic devices having a highly selective violet light transmissive filter and related methods
Ophthalmic devices are provided having a violet-light vertical cut-off filter abruptly absorbs light between the wave lengths of between approximately and 400 nm and 450 nm such that a curve when plotted as percent transmission versus wavelength has the shape as depicted in FIG. 2 . In one embodiment the ophthalmic devices are made from acrylates and the light absorbing compound is an Eastman Yellow 035 MA dye.
1. An ophthalmic device, comprising:
a body having a center aperture for transmitting light onto the retina of an eye;
a dye disposed within at least a portion of said aperture;
said center aperture having a first transmittance of approximately 10 percent at a first wavelength that is between 420 nm and 450 nm;
said center aperture having a second transmittance at a second wavelength that is about 10 nm greater than said first wavelength, said second transmittance being about 50 percent.
2. An ophthalmic device according to claim 1 , wherein said ophthalmic device has substantially no optical power.
3. An ophthalmic device according to claim 1 , wherein said ophthalmic device is a lens.
4. An ophthalmic device according to claim 1 , wherein said ophthalmic device is an intraocular lens.
5. An ophthalmic device according to claim 1 , wherein said ophthalmic device is a contact lens.
6. An ophthalmic device according to claim 1 , wherein said ophthalmic device is a spectacle.
7. An ophthalmic device according to claim 1 , wherein said first wavelength is between about 420 nm and about 440 nm.
8. An ophthalmic device according to claim 1 , wherein said first wavelength is about 430 nm and said second wavelength is about 440 nm.
9. An ophthalmic device according to claim 1 , wherein said first wavelength is about 424 nm and said second wavelength is about 435 nm.
10. An ophthalmic device according to claim 1 , wherein said first wavelength is about 439 nm and said second wavelength is about 448 nm.
11. An ophthalmic element, comprising:
a body having a center aperture for transmitting light onto the retina of an eye;
a dye disposed within at least a portion of said aperture;
said center aperture characterized by a transmittance function over a wavelength range between 420 nm and 450 nm;
said transmittance function having a slope over at least a portion of the wavelength range that is greater than about 3 percent change in transmittance per nanometer change in wavelength.
12. An ophthalmic element according to claim 11 , wherein said transmittance function has a slope over at least a portion of the wavelength range that is greater than about 4 percent change in transmittance per nanometer change in wavelength.