Temple Arm Length
The temple arm length is measured from the beginning to the end including the bend at the end of the arm.
Most common temple arm length falls between 120 mm and 150 mm. Supposing our sunglasses have the following dimensions: 55–17–140, the third number 140, refers to the temple.
The sunglasses dimensions used as a reference are Emporio Armani EA 4025 5026/13 55