Apparatus for examining anterior portions of the eye

US4403841A · kind A · utility

Assignee

• Carl Zeiss Stiftung · DE

Inventors

• Walter Lang · Oberkochen, DE
• Franz Muchel · Oberkochen, DE

Key dates

• Filing date: Nov 12, 1980
• Grant date: Sep 13, 1983
• Expiry date: Nov 12, 2000

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B3/135
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The invention provides an ophthalmological technique and instrumentation for making better and more facile examinations of the anterior portion of an eye, by employing a known interference-contrast technique in on-axis combination with an illumination-source, and having the feature of binocular-microscope viewing. In the form described, polarized light from the source is introduced to the microscope-objective axis at a location between a Nomarski prism and the associated analyzer of the interference-contrast system. This polarized light passes through the Nomarski prism and the microscope objective enroute to the eye being examined; from the eye, it is reflected back through said objective and prism to the analyzer, where a beam-splitting prism serves the respective ray paths of a binocular-microscope viewing system.