Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1979-12-04
1984-01-24
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351169, G02C 702
Patent
active
044272723
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a novel eyeglass lens in the form of an aniseikonia lens with progressive magnification which is to be worn in front of the non-operated eye in the case of unilateral lenslessness (aphakia) or a unilateral artificial lens (pseudophakia).
BACKGROUND ART
An aniseikonia lens with progressive magnification without near correction which has the same optical effect for near and far vision (plane lens or spherical and/or cylindrical correction) and, in addition, has a special and progressive image magnification when looking down through the near portion of the lens is not known.
DISCLOSURE OF INVENTION
A novel aniseikonia eyeglass lens with progressive magnification (for the healthy eye) to be worn in the case of unilateral lenslessness (aphakia) or following a unilateral implantation of an artificial lens (pseudophakia), characterized in that, in addition to the conventional equal optical effect for far and near vision (plane lens or spherical and/or cylindrical correction), the lens effects a special and progressive image magnification when looking down through the near portion. Accordingly, this lens is a novel aniseikonia lens with progressive magnification which does not effect the near correction but a continuously increasing image magnification of from 2% to 6% when lowering the line of vision in order to approximately equalize the retinal images in the two eyes of a patient.
Eyeglass lenses having an exclusive or additional image-magnifying effect, or so-called aniseikonia lenses, have heretofore been used, particularly in the cases of unilateral lenslessness or pseudophakia (artificial lens for the eye following a cataract operation), only for far correction or near correction alone or as bifocal lenses.
Those patients which have been successfully operated on the unilateral cataract and do not yet require a near addition or require only a weak near addition for the healthy eye, have significant difficulties with respect to their vision in the near zone when using the conventional eyeglasses, because the differences in the size between the retinal images of the operated and the non-operated eye are too large. The same is true for patients of these age groups having a unilateral artificial lens (pseudophakia). In this case, the image of the operated eye which is corrected by means of a lens becomes too large when compared to the non-operated eye. The inventor was able to prove this fact in numerous scientific papers published during the last six years by means of the "intraocular optics" which the inventor developed and introduced into the clinical ophthalmology.
The present invention of a novel eyeglass lens for the non-operated eye reduces the difference in size by means of a special and novel eyeglass lens which either has no or a conventional optical effect and additionally a special progressive magnification. Accordingly, this lens is a novel aniseikonia lens with progressive magnification with or without an optical effect of the conventional type for near vision and far vision and without an additional near correction which effects a continuously increasing image magnification of from 2% to 6% when the line of vision is lowered, i.e., this lens is an aniseikonia lens of a special type. The continuous image magnification for near vision is effected by a shape of the lens in the near portion which is adjusted to the optical requirements. The thickness in the center and the anterior and posterior curvatures in the near portion of the lens are adjusted to each other in such a manner that the desired progressive image magnification of from 2% to 6% is obtained.
A drawing must be different for each desired lens power. In the following paragraph, an example of a lens having progressive image magnification of from 1% to 4% without additional correction is described with the aid of the drawing representing a front view and a side view of the lens.
BRIEF DESCRIPTION OF DRAWINGS
The drawing illustrates a cross-section and front view of the anisekenia eyeglass l
REFERENCES:
patent: 1996086 (1935-04-01), Styll
patent: 2256587 (1941-09-01), Amas et al.
patent: 2869422 (1959-01-01), Cretin-Maitanaz
patent: 3140338 (1964-07-01), Stollerman
patent: 3950082 (1976-04-01), Volk
patent: 4055379 (1977-10-01), Winthrop
Koetting, R. A. et al, "Progressive Addition Spectacles over Contact Lenses in Aphakia," American Journal of Optometry and Archives, vol. 46, No. 6, Jun. 1969, pp. 470-475.
Corbin John K.
Sugarman Scott J.
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