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Temple length in eyewear is a crucial factor for comfort, as it determines how well the glasses fit behind the ears. Costa offers a range from 113 mm to 145 mm, catering to a wide variety of head sizes. Here's a breakdown of how these differences impact fit:

Basics of Temple Length:

• Temple length is measured in millimeters (mm) and indicates the length of the glasses' temples.
• The correct temple length ensures that the glasses sit securely and comfortably behind the ears, without pinching or slipping.

Differences for Various Head Sizes:

• Small Head Sizes (e.g., children, adolescents, petite adults):
  • Shorter temple lengths (e.g., 113 mm to 125 mm) are ideal here.
  • They prevent the glasses from sitting too loosely or sticking out behind the ears.
  • A temple length that is too long for small heads will cause the temples to bend too far behind the ear, resulting in uncomfortable pressure.
• Medium Head Sizes (typical adult sizes):
  • Medium temple lengths (e.g., 130 mm to 140 mm) generally provide a good fit.
  • These sizes fit most adults and ensure a stable hold.
• Large Head Sizes (e.g., larger men, adults with wider heads):
  • Longer temple lengths (e.g., 140 mm to 145 mm) are necessary.
  • They prevent the glasses from sitting too tightly on the temples or pressing behind the ears.
  • For large heads, a temple length that is too short is uncomfortable, as the glasses will already press in front of the ears.

Additional Considerations:

• The temple tips can often be slightly adjusted to achieve an even better fit. An optician can help with this.
• The shape of the temples also plays a role. Curved temples generally provide a more secure hold.

Costa's range of temple lengths allows for finding suitable glasses for almost any head size. Choosing the right temple length is crucial for the comfort and stability of the glasses.