An apparatus for quantifying a level of neurological impairment comprising: a portable housing; a microcontroller coupled to the housing; a light source coupled to an interior of the housing and operably coupled to the microcontroller; and a first camera and a second camera coupled to the interior of the housing and operably coupled to the microcontroller, wherein: the housing is adapted to fit over a user's eyes and block external light from reaching eyes of a user; a display for locating in a field of vision of the user; the light source is operable to emit light visible to the user on the display; the first camera is operable to record a direction, a movement, and a dilation of a right pupil of the user; the second camera is operable to record a direction, a movement, and a dilation of a left pupil of the user; characterised in that the microcontroller is configured to perform a smooth pursuit with error correction task, and wherein the smooth pursuit with error correction task includes the microcontroller: controlling the light source to move the light in a predictable pattern across the display; controlling the light source to reverse a direction of the pattern at a random point in time to cause the user to temporarily lose track of the light; and measure an amount of time for the user to correctly track the light moving in the new direction. a portable housing; a microcontroller coupled to the housing; a light source coupled to an interior of the housing and operably coupled to the microcontroller; and a first camera and a second camera coupled to the interior of the housing and operably coupled to the microcontroller, wherein: the housing is adapted to fit over a user's eyes and block external light from reaching eyes of a user; a display for locating in a field of vision of the user; the light source is operable to emit light visible to the user on the display; the first camera is operable to record a direction, a movement, and a dilation of a right pupil of the user; the second camera is operable to record a direction, a movement, and a dilation of a left pupil of the user; characterised in that the microcontroller is configured to perform a smooth pursuit with error correction task, and wherein the smooth pursuit with error correction task includes the microcontroller: controlling the light source to move the light in a predictable pattern across the display; controlling the light source to reverse a direction of the pattern at a random point in time to cause the user to temporarily lose track of the light; and measure an amount of time for the user to correctly track the light moving in the new direction. the housing is adapted to fit over a user's eyes and block external light from reaching eyes of a user; a display for locating in a field of vision of the user; the light source is operable to emit light visible to the user on the display; the first camera is operable to record a direction, a movement, and a dilation of a right pupil of the user; the second camera is operable to record a direction, a movement, and a dilation of a left pupil of the user; characterised in that the microcontroller is configured to perform a smooth pursuit with error correction task, and wherein the smooth pursuit with error correction task includes the microcontroller: controlling the light source to move the light in a predictable pattern across the display; controlling the light source to reverse a direction of the pattern at a random point in time to cause the user to temporarily lose track of the light; and measure an amount of time for the user to correctly track the light moving in the new direction. controlling the light source to move the light in a predictable pattern across the display; controlling the light source to reverse a direction of the pattern at a random point in time to cause the user to temporarily lose track of the light; and measure an amount of time for the user to correctly track the light moving in the new direction.