Method and apparatus for measuring tear film thickness using optical interference
US11614321B2 · kind B2 · utility
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21Claims
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Key dates
| Filing date | Mar 25, 2020 |
| Grant date | Mar 28, 2023 |
| Priority date | — |
| Expiry date | Jul 11, 2040 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/14
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An interferometric method of identifying the thickness of an object that is too thin to be resolved by a Fourier transform of the interference signal includes applying a harmonic frequency modulation to an envelope of the interference signal. Where the object is a tear film, this method may be utilized to determine a thickness of the lipid layer of the tear film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.