Importance

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Abstract

This invention pertains to a novel compact hand-held optical system whch is used both as a light condenser and as an aerial image former in the examination of the fundus of the eye with the indirect ophthalmoscope and with the slit lamp biomicroscope. The novel optical system has the unique feature that the aerial image of the fundus produced by it is upright rather than inverted as in the present state of the art with hand-held indirect ophthalmoscopy lenses. The novel optical system consists of three coaxial air-spaced double aspheric lenses which are so designed and positioned as to converge the illuminating light beam from the light source such that an image of said source is formed at the center of the pupil of the examined eye, the light then diverging from said image to illuminate the fundus of the eye. The light emerging from the eye through its pupil is then refracted by the novel optical system to form an upright aerial image of the fundus between the lens system and the indirect ophthalmoscope with which the upright aerial image is viewed, in a first embodiment of the invention, and between the lens system and the slit lamp biomicroscope with which the upright aerial image is viewed, in a second embodiment of the invention.

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First Claim