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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