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US 4,067,646 AGranted
Eyeground inspecting contact lens
AssigneeNippon Kogaku K.K.
InventorMasao Nohda
Life of this patent
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AssigneeNippon Kogaku K.K.
InventorMasao Nohda
Estimating the term…
An eyeground inspecting contact lens adapted to be disposed in contact with the cornea of an eye to be inspected, in order that an illuminating light may be directed to the fundus of the eye so as effectively to illuminate the same for the observation of the eyeground, comprises a plurality of glass bodies having the incidence surface thereof inclined with respect to the optical axis. The refractive indices of the glass bodies, the inclined angle of the incidence surface with respect to the optical axis and the inclined angle of the boundary surface of each of the glass bodies with respect to the optical axis are selected such that, of the illuminating light flux, the light beam coincident with the optical axis prior to incidence on the first glass body is made parallel to but spaced from the optical axis after being passed through the glass bodies, and then impinges on the eyeground.
An eyeground inspecting contact lens adapted to be disposed in contact with the cornea of an eye to be inspected, in order that an illuminating light may be directed to the fundus of the eye so as effectively to illuminate the same for the observation of the eyeground, said contact lens comprising a plurality of glass bodies having the incidence surface thereof inclined with respect to the optical axis, the refractive indices of said glass bodies, the inclined angle of said incidence with respect to the optical axis and the inclined angle of the boundary surface of each of said glass bodies with respect to the optical axis being selected such that, of the illuminating light flux, the light beam coincident with the optical axis prior to incidence on the first glass body is made parallel to but spaced from the optical axis after passing through said glass bodies, and then impinges on the eyeground.
Dependencies are inferred from the claim text.