Eyeball tissue characteristic frequency measurement device and non-contact tonometer utilizing the same
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United States of America Patent
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Oct 1, 2013
Grant Date -
May 19, 2011
app pub date -
May 14, 2009
filing date -
May 15, 2008
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Abstract
A non-contact tonometer of the present invention quantitatively measures characteristic vibration of the cornea of an eyeball and measures a true ocular pressure utilizing this vibration, and comprises: an air flow spray unit (200) spraying an air flow (F) to a cornea (C) of an eye (E) to be examined and deforming the cornea; a cornea deformation amount measurement unit (300) measuring deformation of the cornea caused by the air flow spray unit along with elapsed time from the start of the air flow spray; a Fourier analysis unit (401) performing Fourier analysis on a relationship between a deformation amount of the cornea obtained by a cornea deformation detection unit and the elapsed time; an eyeball tissue characteristic frequency operation unit (402) obtaining an characteristic frequency of each constituent tissue of the eyeball based on a Fourier analysis result obtained by the Fourier analysis unit; and an ocular pressure operation unit (403) calculating an ocular pressure based on the characteristic frequency of the cornea obtained by the eyeball tissue characteristic frequency operation unit.
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