Certified Ophthalmic Assistant Practice Exam

What are the two types of bridges found on a spectacle frame?

1. Round and Flat

2. Keyhole and Saddle

3. Adjustable and Fixed

4. Metal and Plastic

The correct answer is: Keyhole and Saddle

The correct answer identifies the two types of bridges commonly found on spectacle frames: keyhole and saddle. A keyhole bridge features a cut-out shape that allows the frame to sit comfortably without resting too heavily on the nose, making it suitable for individuals with different nose shapes. This design helps to evenly distribute the weight of the glasses, enhancing comfort during long periods of wear. On the other hand, a saddle bridge is a more traditional style that has a smooth, continuous curve that sits snugly on the nose. This type provides a stable and secure fit, as it cradles the nose and often leads to a more balanced feel when wearing the glasses. The other options describe different aspects of spectacle frames or materials but do not specifically refer to the distinct styles of bridges. For example, while adjustable and fixed can relate to different frame adjustments, they do not define design types. Similarly, metal and plastic pertain to the materials used in frame construction rather than the specific design features of the bridge. Round and flat describe frame shapes but don't categorize bridge types. Thus, keyhole and saddle bridges are indeed the distinct classifications that best address the question.