Video-oculography

Video-oculography (VOG) is a non-invasive method used to record eye movements. It is a type of eye tracking technology that uses infrared light to capture the motion of the eyes. This technique is commonly used in neurology, psychology, and vision science to study the visual system and brain function.

Overview

Video-oculography works by shining infrared light onto the eye. The light is reflected back from the eye and captured by a camera. The camera then records the changes in the reflection as the eye moves. This data can be used to calculate the direction and speed of eye movements.

VOG is often used in research settings to study saccades, smooth pursuit movements, and fixations. It can also be used clinically to diagnose and monitor conditions such as nystagmus, strabismus, and amblyopia.

Method

The subject is typically seated in front of a monitor with their head stabilized by a chin rest. The infrared camera is positioned to capture the reflection from the eye. The subject is then asked to follow a target on the screen with their eyes. The camera records the eye movements as the subject tracks the target.

The data from the camera is processed by a computer, which calculates the direction and speed of the eye movements. This information can be used to create a detailed map of the eye's movement patterns.

Applications

Video-oculography has a wide range of applications in both research and clinical settings. In research, it is often used to study the visual system and brain function. For example, it can be used to investigate the neural mechanisms underlying saccades and smooth pursuit movements.

In clinical settings, VOG can be used to diagnose and monitor conditions that affect eye movements. For example, it can be used to detect nystagmus, a condition characterized by involuntary eye movements. It can also be used to monitor the progress of treatments for conditions such as strabismus and amblyopia.

See also

• Eye tracking
• Saccades
• Smooth pursuit
• Fixations
• Nystagmus
• Strabismus
• Amblyopia