American Board of Opticianry (ABO) Practice Test

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Which type of bridge is the most common bridge type found on most plastic frames?

  1. Saddle Bridge

  2. Keyhole Bridge

  3. Browline Bridge

  4. Wrap Bridge

The correct answer is: Saddle Bridge

The most common bridge type found on most plastic frames is the Saddle Bridge. This type of bridge rests comfortably on the nose due to its curved shape resembling a saddle. It provides stability and distributes weight evenly, making it a popular choice for plastic frames. Keyhole Bridge, Browline Bridge, and Wrap Bridge are less common bridge types found on plastic frames. The Keyhole Bridge is characterized by a keyhole-like shape in the center, the Browline Bridge mimics the shape of eyebrows, and the Wrap Bridge is designed to wrap around the sides of the nose.

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