Which lenses provide clear distance, near and intermediate vision?

• A. Trifocals
• B. Bifocals
• C. Progressives
• D. Single vision

Answer: (A)

This item tests your understanding of lens designs that offer three viewing ranges: distance, intermediate, and near. Trifocals are designed with three distinct segments, each optimized for a different working distance. The top portion provides clear distance vision for looking across the room, the middle portion is set for intermediate tasks like computer work or dashboards, and the bottom portion is for near tasks such as reading.

Because these three zones are separate and purposefully labeled by segment, trifocals make it easy to shift focus across far, middle, and close distances with clear vision in each range. Bifocals, on the other hand, have only two zones—distance and near—so they don’t provide a dedicated intermediate range. Progressives do offer distance, intermediate, and near vision as well, but they provide a gradual, continuous change in lens power rather than three distinct segments, which is a different design approach. Single-vision lenses have only one focal length and thus cannot provide all three viewing distances.