Optical system for illuminating the ground of the eye

US4272165A · kind A · utility

Assignee

• Carl Zeiss Stiftung · DE

Inventors

• Franz Muchel · Oberkochen, DE
• Albrecht Vogel · Oberkochen, DE

Key dates

• Filing date: Jan 10, 1978
• Grant date: Jun 9, 1981
• Expiry date: Jan 10, 1998

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B3/12
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The invention contemplates an improved optical system for illuminating the retina or ground of the eye and having particular application to a hand-held ophthalmoscope. The optical system, thus embodied, permits selective modification of image scale, for a test mark or marks projected in the eye. Two embodiments are disclosed.