Method and device for determining the distance from a measurement point on a tissue surface of the eye

The invention relates to a method and a device for determining the distance from a measurement point on a tissue surface (10, 13) of the eye (02), wherein a) an initial light pulse (09a) is generated using a pulse light source (03) and is directed onto the measurement point of the eye, b) a reflecto...

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Bibliographic Details
Main Author KOEST GERT
Format Patent
LanguageEnglish
Published 18.08.2009
Subjects
DIAGNOSIS
HUMAN NECESSITIES
HYGIENE
IDENTIFICATION
MEDICAL OR VETERINARY SCIENCE
SURGERY
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Summary:The invention relates to a method and a device for determining the distance from a measurement point on a tissue surface (10, 13) of the eye (02), wherein a) an initial light pulse (09a) is generated using a pulse light source (03) and is directed onto the measurement point of the eye, b) a reflector light pulse (11) reflected on the tissue surface (10, 13) at the measurement point is intercepted by a light sensor (04), c) a follow-up light pulse (09b) of the pulsed light source (03) is triggered by the detection of the reflector light pulse (11) at the light sensor (04), d) the pulsed light source (03) generates further follow-up light pulses (09b) depending on the detection of the reflector light pulses (11) caused by the respectively preceding follow-up light pulses (09b) and thereby oscillates at a frequency F1, e) the frequency F1 is measured directly or indirectly, f) the length X of the ray path starting from the pulsed light source (03) via the measurement point to the light sensor (04) is derived from the measured value F1 and the specific speed of light c at which the light propagates in the medium along the ray path.
Bibliography:Application Number: US20060638247