Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1991-10-21
1993-08-10
Sugarman, Scott J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
G02C 710
Patent
active
052353583
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a light filter, which is either located in the region of the eye or that filters the light before it reaches the visual field.
INDUSTRIAL APPLICABILITY
Among many people, particularly older persons, the cornea and lens of the eyes are subject to disturbances with reference to the light transmission. These disturbances, which are frequently referred to as cataracts, result in the scattering of light incident on the eye and in inherent fluorescence. These effects appearing in the lens cause dazzling and swamping phenomena which lead to a reduction of visual acuity and the contrast vision. The short-wave spectral range of the light is scattered considerably more than the longer-wave range, furthermore it causes the fluorescence in the lens. In addition to this, the short-wave spectral portion also impairs the vision of people with retina-related weakness of vision.
PRIOR ART
Hitherto, this pathological change in the eye, also referred to as grey cataracts, has been treated surgically. In this operation, the lens is removed surgically and the missing lens is, in an older method, compensated for by cataract lenses. The glasses of these cataract lenses comprise a high diopter rating, are thick, heavy and disfigure the appearance of the wearer considerably due to the great distortions.
A modern method is to implant a lens made of plastic to replace the removed natural lens. Here, too, as with the cataract lenses, the eye can no longer accommodate, that is to say adjust itself sharp to the different distances of the viewed object. In addition to the considerable physiological and psychological discomfort, the lack of accommodation impairs strongly also the viewing ease as compared with people with normal eyesight.
DESCRIPTION OF THE INVENTION
It is the object of the present invention to provide a light filter which postpones the otherwise necessary eye operations or even renders them superfluous.
The invention makes it possible for people suffering from weakness of vision to see better by improving the visual acuity and the contrast vision, respectively. There are a lot of people who are almost blind because of different eye infirmities and visual error, and whose weakness of vision is based on the loss of the visual acuity and the contrast vision, respectively.
The invention provides essential advantages for people with healthy eyes too. So the psychological essential effect of continuous sun shining shall be given and the colour contrast and the stereoscopic vision shall be improved. The vision conditions shall be improved in fog, rain or in a snow-storm. These positive effects in particular are advantageous for people driving motor vehicles, guiding boats or flying aircraft and for participation in and view of fast sports.
On one hand it is decisive, that the spectral portion of the radiation with a wave length smaller than 450 nm (ultraviolet, violet, blue) is filtered out totally or at least partly, before the radiation enters the eye. On the other hand a greater radiation portion, the wave length of which is above 450 nm, must enter the eye and reach the retina to deliver enough information for good viewing ease.
The practical solution of this problem is achieved basically by two different methods: spectacles or in a clip-on lens attached to the spectacles.
In the second case, the daylight entering the room is filtered in the area of the entrance place (e.g. window, skylight, door glazing). In the case of artificial room lighting, the light is filtered in the area of the lamp. In the case of TV sets, monitors, etc. the filtering of the emitted light can take place in front of or on the screen. Filtering can be effected in this cases among others by placing a light filter in front of the light source in the form of a foil, pane or housing, or in the form of lacquer or interference coatings.
This problem is solved according to the invention in such a way, that by means of the light filter the visual acuity and the contrast vision will be improved throu
REFERENCES:
patent: 4470673 (1984-09-01), Gilson et al.
patent: 4783142 (1988-11-01), Mutzhas
"Purchasing Information, Melles Griot B.V. 1975 for Colored Glass Filters With Curves".
Mutzhas Maximillian F.
Zigman Seymour
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