front 1 ENG | back 1 electronystagmography |
front 2 VNG | back 2 Videonystagmography |
front 3 What is EOG measuring? | back 3 measures the changes in voltage due to eye movement |
front 4 What is VOG measuring? | back 4 use of infrared light sensors to detect eye movement |
front 5 Horizontal channel | back 5 Right eye movement is shown as an upward pen tracing Left eye movement is shown as a downward pen tracing |
front 6 Vertical channel | back 6 Upward eye movement is shown as an upward movement of the pen Downward eye movement is shown as a downward movement of the pen |
front 7 Benefits to ENG | back 7 Initially less expensive Can record a larger number degrees of eye movement can be used for certain populations (individuals with droopy eyelids, those who can’t keep eyes open, children younger than 5) |
front 8 Drawbacks to ENG | back 8 affected by ambient light (needing frequency recalibration) affected by retinal pathology eye blink artifact less accurate measuring vertical eye movement, not sensitive to torsional eye movement, Bell’s Phenomenon, and DC drift. |
front 9 Benefits to VNG | back 9 Does not require electrodes can video record movements for later analysis easier to monitor eye movements while testing easier to measure individual eye movements (if bilateral recordings) |
front 10 Drawbacks to VNG | back 10 Narrow angular range can’t be measured with eyes closed size and weight of goggles can be affected by eye makeup. |
front 11 What is the potential we are measuring for ENG? | back 11 Uses EOG to record eye movements during a series of tests designed to assess the function of the vestibular and oculomtor systems. EOG is recording of changes in DC voltage that is caused by the eye movements |