Figure 1
The Headset Device from the Rear (from the Patient's Perspective).
The device is made of nylon plastic and is lightweight and flexible. Two mirrors reflect the LEDs from the back of the unit on each side to 7 degrees into the subject's visual field. A comfortable rubber sealing system that surrounds the unit-to-head interface ensures that little light enters the device and that consistent background luminance is maintained. A flexible, elasticated strapping system ensures that the device is fixed securely to the participant's head comfortably during the test.
Figure 2
Illustrating the Visual TDT (in ms) Determined by the Traditional Table-top and Novel Headset Methods in Each of the Four Control Groups.
Paired t-tests of differences in means with headset and table-top values within each group are shown, all p-values are non-significant, consistent with no significant difference in means between each device in each group. Males 18–35, blue circles; females 18–35, red circles; males 36–65, blue circles; females 36–65, red circles. ms: Milliseconds; TDT, Temporal Discrimination Threshold.
Table 1
The Visual TDT in Healthy Control Participants, by Gender and Age subgroup, using Headset and Table-top Methods.
| Males18–35 years (n = 24) | Females 18–35 years (n = 24) | Males 36–65 years (n = 24) | Females 36–65 years (n = 24) | |
|---|---|---|---|---|
| Headset method | ||||
| Mean TDT (ms) | 37.3 | 31.4 | 45.9 | 36.6 |
| SD TDT (ms) | 14.2 | 15.9 | 13.1 | 13.4 |
| ULN (mean+2.5 SD) | 72.8 | 71.2 | 78.7 | 70.1 |
| Table-top method | ||||
| Mean TDT (ms) | 37.2 | 30.9 | 39.5 | 30.9 |
| SD table-top TDT | 14.9 | 14.2 | 17.8 | 18.5 |
| ULN (mean+2.5 SD) | 74.5 | 66.4 | 84.0 | 77.2 |