Open Access
Table 2
Relationships between goggle size and head-feature points.
| Dimension parameter | Dimension | Explanation | Relationship with head-feature points (Fig. 2) |
|---|---|---|---|
| a1 | Width of the lens | Width of the lens should correspond to the width of the red line in Fig. 4 | 5,6,8,9 |
| a2 | Width of the bridge | Width of the lens and the black vertical line in Fig. 4 | 4,5,6 |
| a3 | Angle of the bridge of the nose | determine where the frame meets the bridge of the nose | 4,5 |
| a4 | Height of the lens | Height of the goggles should correspond to the height of the red line in Fig. 4 | 3,4,5,7,10 |
| a5 | Width of the frame | Width of the frame | - |
| a6 | Relative thickness of the frame | Vertical distance between the bridge and the edge of the frame | 4,7 |
| a7 | Angle of the arm | Angle between the leg and the vertical black line in Fig. 4 | 4,7,8 |
| a8 | Curve of the lens frame | Curve of the frame is the curve where the goggles are in contact with the human head | 3,4,6,7,8,9,10 |
| a9 | Thickness of the goggle frame | Thickness of the goggle frame | - |
| a10 | Position of the goggles | Position of the lens in the frame | 5,7,8,10 |
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