title: Ocular microtremor measurement using laser-speckle metrology.
abstract: We describe a novel, noninvasive measurement approach for recording a small involuntary tremor of the eye known as ocular microtremor. The method is based on measuring out-of-plane angular displacements of a target by using laser-speckle correlation of images recorded in the Fourier plane of a lens. The system has a dynamic range of 4 to 5000 μrad, resolution of 4 μrad, and a bandwidth of 250 Hz. The design and optimization of the system is presented with an in vitro validation of the system against its specification.
authors.affiliation: Trinity College Dublin, School of Medicine, Dublin 2, Ireland. kennye3@tcd.ie
authors.forename: Emer
authors.initials: E
authors.lastname: Kenny
authors.forename: Davis
authors.initials: D
authors.lastname: Coakley
authors.forename: Gerard
authors.initials: G
authors.lastname: Boyle
mesh_terms: D003198:Computer Simulation; D005133:Eye Movements; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D007834:Lasers; D008954:Models, Biological; D010781:Photography / Q000379:methods*; D012815:Signal Processing, Computer-Assisted