Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1996-09-12
1998-08-04
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351211, A61B 310
Patent
active
057902330
ABSTRACT:
A the device for carrying out keratometric measurements has a beam splitter (9) which can be pivoted about a pivot axis (37) in a defined way. The beam splitter (9) serves for dividing and simultaneously for recombining the partial beams. The pivot axis (37) of the beam splitter (9) extends perpendicularly to the optical axis (o) of the beam (5a) reflected by the curve region (K) to be measured of the cornea of the living eye (A), as well as perpendicularly to the connection line of the test objects (B, Q). By pivoting the beam-splitter cube (9) the image height imaging (h') of the reflection points (Y,Z) can be doubled and shifted relative to one another in a defined way according to the selected pivot angle (.alpha.). The device has a compact construction and permits simple and exact operation.
REFERENCES:
patent: 2174308 (1939-09-01), Hartinger
Stucki Jurg
Ulbers Gerd
Dang Hung X.
Haag-Streit AG
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