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US 2003/0197856 A1Published application
Refractometer (Milanich's tester)
AssigneeNone recorded
InventorAlexander Ivanovich Milanich
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AssigneeNone recorded
InventorAlexander Ivanovich Milanich
Estimating the term…
The present invention relates to the field of medical technique, and more precisely relates to refractometers used for determining vision parameters. A refractometer of the present invention increases the accuracy of measuring vision parameters while simplifying refractometer design. This device can further be used to train the eye muscles using corresponding medical methodologies. The first embodiment of the refractometer comprises an optical focusing element (1), a test-object (2), an optical axis (3), and a measuring element (4). The optical focusing element is in optical alignment with the test-object, which in the case of a normal vision placed in the focus of the optical focusing element. The optical focusing element and the test-object are arranged so as to allow their mutual displacement along the optical axis.
A refractometer comprising:
A refractometer comprising:
A refractometer comprising:
A refractometer comprising:
Dependencies are inferred from the claim text.
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Subjective types, i.e. testing apparatus requiring the active assistance of the patient: for testing visual acuity; for determination of…
Medical diagnosis and surgery
Term end not estimated
1. Field of the Invention
The invention relates to medical instruments, more exactly to refractometers used for determination of vision parameters
2. Description of the Prior Art
The invention is explained by an example of the preferable embodiment with references to the following figures:
FIG. 1a—is a schematic representation of rays coming exactly on the eye retina for a normal vision.
FIG. 1b—is a schematic representation of rays coming on the eye retina in a myopic eye.
The first embodiment of the refractometer, schematically presented on FIG.3, contains a focusing optical element 1, optically aligned with a test-object 2, an optical axis 3, and also a measuring element 4. For a case of the normal vision the test-object would be located in a focal plane of the focusing optical element. The test-object and the focusing optical element are movable relative to each other along the optical axis. The measuring element 4 measures a distance between the focusing optical element 1 and the test-object 2.
Within the description of the disclosed invention, we shall mean as mutual displacement of the focusing optical element 1 and the test-object 2 along the optical axis, the following cases of possible movements:
The focusing optical element is stationary and the test-object is movable along the optical axis.