Wearing a helmet will:

Question

With few exceptions, the risk of head and neck injuries is reduced by the proper use of an approved helmet. Any approved helmet design will allow you to see as far to each side as is necessary for safe riding.

Accepted Answer

Reduce your chances of neck and head injuries in the event of a crash.

Answer

Increase your chances of a neck injury in the event of a crash.

Answer

Reduce your vision by two-thirds.

Answer

Neither reduce nor increase your chances of a head injury in the event of a crash.