page_title: Oculometer
section_title: Optical components
hierarchical_section_title: Oculometer / Optical components
caption_attribution_description: English: A schematic of the oculometer, depicting the arrangement of the light source, objective lens, beam splitter, two polarizing lenses, detector, and eyepiece.
context_page_description: Oculometer is a device that tracks eye movement. The oculometer computes eye movement by tracking corneal reflection relative to the center of the pupil.An oculometer, which can provide continuous measurements in real time, can be a research tool to understand gaze as well as cognitive function. Further, it can be applied for hands-free control. It has applications in flight training, cognitive assessment, disease diagnosis, and treatment. The oculometer relies on the principle that when a collimated light beam is incident on the eye, the direction in which the eye moves is proportional to the position of the reflection of that light beam from the cornea with respect to the center of the pupil. Eye movements can be accurately measured over a linear range of more than 20 with a resolution of 0.1.
context_section_description: Light source: Source of illumination such as cathode ray tube or glow modulator tube
  Filter: light is filtered such that light incident on the eye is near infrared
  Polarizer: light from the source is polarized to capture only true corneal reflections
  Eyepiece: the user looks through an objective lens in an eyepiece, through which the illumination beam travels to irradiate the eye
  Lenses: two collimating lenses
  Beam splitters: one beam splitter directs visible light to the eye, the other directs light to the detector
  Detector: a silicon diode camera records measurements
caption: A schematic of the oculometer, depicting the arrangement of the light source, objective lens, beam splitter, two polarizing lenses, detector, and eyepiece.
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