Eyeball tissue characteristic frequency measurement device and non-contact tonometer utilizing the same
US8545404B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 2009 |
| Grant date | Oct 1, 2013 |
| Priority date | — |
| Expiry date | May 9, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/16
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.