On/Off Button

Power Button

To power on the HGpeN, push and hold the Power button for 2 seconds. When the device is turned on, the LED light on the end of the HGpeN will illuminate. Once illuminated, this indicates the HGpeN is ready for use. To power off the HGpeN, push and hold the Power button until the light turns off. Test buttons will not operate unless the unit is powered on.

Smooth Persuit

Increasing Volume – SP Button

When the HGpeN is powered on, push and hold the SP button for two seconds. A beep will emit as the volume increases. Release button when you reach desired volume. There are five volume level ranges, 1 being lowest and 5 being highest. The factory default volume is set to level three.

Maximum Deviation

Decreasing Volume – MD Button

When the HGpeN is powered on, push and hold the MD button for two seconds. A beep will emit as the volume decreases. Release button when you reach desired volume. You can also set the HGpeN to “vibrate only” mode by holding the MD button down until the beep is no longer audible.

Equal Tracking/Equal Pupil Size – SP Button

Smooth Persuit
  • Equal Tracking timing is the same as that for Smooth Pursuit. Utilize the “SP” button to check for Equal Tracking.
  • First, check both eyes for equal pupil size and resting nystagmus. Both pupils should be of equal size and there should not be any noticeable nystagmus.
  • To check for Equal Tracking, push the SP button and release to start the test.
  • Once the initial single beep/vibrate occurs, move the HGpeN smoothly to your right (checking the subject’s left eye first).
  • Two seconds after the initial beep/vibrate, the HGpeN will emit a double beep/vibrate indicating you should have reached endpoint.
  • Begin moving the HGpeN smoothly back to the left towards center point at the same speed used to reach endpoint.
  • The HGpeN will emit a single beep/vibrate when two seconds has elapsed from endpoint indicating you should be back at center-point.
  • Continue moving the HGpeN smoothly to the left checking the subject’s right eye.
  • The HGpeN will continue for two complete cycles (two passes for each eye) and will emit a triple beep/vibrate when test concludes.
Smooth Persuit

Lack Of Smooth Pursuit – SP Button

  • To check for lack of smooth pursuit, push the SP button and release.
  • Once the initial single beep occurs, move the HGpeN smoothly to your right (checking the subject’s left eye first) bringing the subject’s eye as far to the side as it can go.
  • Two seconds after the initial beep, the HGpeN will emit a double beep indicating you should have reached endpoint.
  • Begin moving the HGpeN smoothly back to the left towards center point at the same speed used to reach endpoint.
  • The HGpeN will emit a single beep when two seconds has elapsed from endpoint indicating you should be back at center-point.
  • Continue moving the HGpeN smoothly to the left checking the subject’s right eye
  • The HGpeN will continue for two complete cycles (two passes for each eye) and will emit a triple beep/vibrate when test concludes.
Maximum Deviation

Distinct/Sustained at Maximum Deviation – MD Button

  • Push MD button and release to start the test.
  • A single beep/vibrate will sound indicating the test has begun.
  • Once the initial single beep/vibrate occurs, move the HGpeN smoothly to your right (checking the subject’s left eye first), until there is no more white of the eye visible.
  • Two seconds after the initial single beep/vibrate, the HGpeN will emit a double beep/vibrate indicating you should have reached maximum deviation.
  • Once you hear the double beep/vibrate, hold the HGpeN at maximum deviation.
  • After the double beep, the HGpeN will emit a single beep/vibrate at 1, 2, and 3 seconds and then a triple beep/vibrate indicating the minimum four seconds has elapsed.
  • Return to center and press the MD button to check the subject’s right eye.
  • This test requires two passes (cycles) for each eye.

Due to the nature of this test, the pen is designed for the user to manually restart the test for each individual pass which allows user the flexibility to hold past the minimum four seconds.

Onset Prior to 45

 Onset of Nystagmus Prior To 45° – 45° Button

  • Push 45° button and release to start the test.
  • A single beep/vibrate will sound indicating the test has begun.
  • Once the initial single beep/vibrate occurs, move the HGpeN to your right (checking the subject’s left eye first) smoothly at a rate that would require four seconds to reach the 45 degree angle.
  • The HGpeN will emit a single beep/vibrate at 1, 2, and 3 seconds.
  • The HGpeN will emit a triple beep/vibrate indicating you have reached the four second mark.
  • If jerking is observed prior to the 45 degree angle, hold the HGpeN at that position and verify the jerking is distinct and sustained (i.e. continuous).
  • The beep/vibrate will continue until the final triple beep/vibrate. This is to help you determine how early you detected the distinct and sustained  nystagmus.
  • Move the stimulus back to center point and repeat the test by pushing the 45° button again.
  • Two individual passes for each eye is required.

Due to the nature of this test, the pen is designed for the user to manually restart the test for each individual pass during the onset prior to 45° evaluation.

Vertical Gaze Nystagmus

 Vertical Nystagmus – VN Button

  • Hold HGpeN horizontally, push the VN button and release.
  • A single beep/vibrate will sound indicating the test has begun.
  • Once the initial single beep/vibrate occurs, smoothly elevate the HGpeN up until the eyes cannot elevate further.
  • The HGpeN will emit a double beep/vibrate indicating when two seconds has elapsed and the pen should be positioned so the subject’s eyes are elevated.
  • Once you hear the double beep/vibrate, hold the HGpeN in this position.
  • The HGpeN will emit a single beep/vibrate at 1, 2, and 3 seconds and then a triple beep/vibrate indicating four seconds has elapsed.
  • If vertical nystagmus is present it must be distinct and sustained (i.e. continuous).

Two individual passes required.

Resetting HGpeN During Test

If at any time you wish to discontinue a test in progress, simply push and release the test button that is in progress. A triple beep will emit indicating you have ended the test. Press and release the test button you wish to restart and the test will begin. If a test is restarted, the HGpeN is programmed to start at the beginning and complete the full test.

Battery

HGpeN requires 1 AAA battery. Twist bottom cap off, place AAA battery in with negative end inserted first and positive end toward the end cap.

Troubleshooting

Problem: The light will not come on, device powers off during test or the light pulses during test. Solution: The issue is commonly attributed to a weak battery. Replace the battery.

This is a condensed video showing the operation of the HGpeN