American Board of Ophthalmology (ABO) Practice Exam

What is the bridge type that spreads weight over the greatest area for eyeglasses?

1. Saddle

2. Keyhole

3. Adjustable

4. Comfort

The correct answer is: Saddle

The saddle bridge design is recognized for its ability to distribute weight effectively across a larger surface area. This characteristic enhances the comfort of the eyeglasses, particularly in minimizing pressure points on the nose. The saddle bridge typically features a smooth, continuous curve that morphs with the natural contours of the face, allowing the weight of the glasses to be shared more evenly. This design is beneficial for individuals who wear their glasses for extended periods, as it reduces the risk of discomfort and marks on the nose that can arise from more narrowly designed bridges. The saddle bridge's broader contact surface contributes to better stabilization of the frames on the face and ensures they remain securely in place without digging into the skin. Other bridge types may not provide the same level of weight distribution. For example, the keyhole bridge can be suitable for certain frame styles but may concentrate weight at specific points on the nose rather than evenly distribute it. Similarly, adjustable and comfort bridges focus on individual fit or added padding but do not necessarily guarantee the same level of area coverage as the saddle bridge design.