Progressive lenses, or varifocals, provide a gradual change in power from distance through intermediate to near within a single spectacle lens. They aim to offer clear vision at multiple distances without visible segment lines.
How They Work
The top of the lens is designed for distance, the middle for intermediate tasks such as computer work, and the lower portion for reading. Power changes smoothly down the lens, with some peripheral areas of distortion that vary between designs.
- Modern designs optimise wider fields for specific tasks or lifestyles
- Precise fitting and measurements are crucial for good performance
- Adaptation may take several days or weeks
- High-quality lens coatings reduce reflections and improve clarity
Benefits and Adaptation
Progressive lenses eliminate the need to swap between multiple pairs of spectacles for different distances. However, they require head and eye movements that some people find unfamiliar initially.
- Best results are achieved when frames sit correctly and are not too small
- Specialist designs are available for extensive computer or near work
- Report persistent distortion, dizziness, or difficulty to your optometrist
- Regular reviews allow adjustments as prescriptions and visual needs change
