Hand-held line grid interference retinometer
AssigneeHeine Optotechnik GmbH & Co. KG
InventorsHelmut Heine, Anton Schneider, Otto H. Schmidt
Life of this patent
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Abstract
An apparatus for testing visual acuity, or clearness of vision, particularly when there is impaired refracting medium in an eye, includes a lamp (1) and a pin-hole diaphragm (4) arranged in a light-beam path downstream of the lamp with a single diffraction grating (6), being provided in the light-beam path downstream of the pin-hole diaphragm.
Claims9
Apparatus for testing visual acuity of an eye of a patient, particularly when there is impaired refracting medium in the eye, comprising a light source (1) and a pin-hole diaphragm (4) arranged in a light-beam path downstream of the light source, wherein only a single diffraction line grid (6) is provided in the light-beam path following the pin-hole diaphragm (4) for creating a line pattern on a retina of the eye of the patient by causing a diffraction spectrum and creating an interference line pattern on the retina.
Dependencies are inferred from the claim text.