These are a must for sunbed users.
They are designed to protect your eyes from the UV light to ensure you avoid eye damage. The skin on the eyelid is too thin to provide sufficient protection.
Some people believe that the use of goggles will cause tan lines however this is a myth. The delicate eye area is unable to tan due to a lack of pigmentation. What's more, goggles and other protective eyewear has been designed to fit the shape of your eye. This means they will not cover more than is needed to keep your eyes safe.
If you do not use eye protection, you are risking your vision. Overexposure to UV can cause eyes to develop scar tissue. This can lead to colour blindness, a loss of night vision as well as other problems which cannot be reversed.