What bridge type balances the weight of metal frames over the entire nasal area?

The correct choice is the strap bridge. This type of bridge is designed to effectively distribute the weight of the eyewear across a wider area of the nasal region. By doing so, it enhances comfort and stability, making it particularly suited for metal frames. With a strap bridge, the frame's overall design accounts for the contours of the nose, providing support without concentrating pressure on specific points.

This design is especially beneficial for individuals who may find traditional bridge styles uncomfortable, as it minimizes the risk of pressure points and improves overall wearability. The strap bridge's unique structure is optimal for balancing metal frames, allowing users to wear their eyewear for extended periods without discomfort.

In contrast, other bridge types like the saddle or keyhole bridge might not distribute weight as evenly and can lead to pressure on limited areas. The comfort bridge, while named for its ergonomic intentions, might not always address weight distribution in the same effective manner as the strap bridge does.