Progressive (Multifocal) Lenses Explained
Progressive lenses are multifocal lenses with no visible lines, designed to provide clear vision at all distances. They look like single-vision lenses but contain multiple focusing powers that gradually change from top to bottom.
This allow you to:
- - See clearly in the distance
- - Focus comfortably at computer range
- - Read and do close work through the near zone
Because the power changes smoothly, there are no abrupt “jumps” in vision like those experienced with traditional bifocals.
How Progressive Lenses Work
Progressive lenses contain three main viewing zones:
- Distance zone: At the top for driving and everyday viewing
- Intermediate zone: In the middle for screens and arm’s-length tasks
- Near zone: At the bottom for reading and fine detail
To use them effectively, you simply move your eyes—not your glasses—to access each specific zone.
Adaptation Period
An adaptation period is very normal, especially for first-time wearers. You may initially notice a brief “swim” sensation when moving your head quickly or mild blur in the far peripheral edges.
This happens because peripheral distortion is an unavoidable optical trade-off in multifocal designs. Modern lenses push these distortions to the far edges, and most people adapt within a few days by naturally adjusting their head movements.
Materials & Thickness
Progressive lenses are available in several materials tailored to your prescription:
- - CR-39 plastic: Lightweight, cost-effective, and clear optics
- - Polycarbonate & Trivex: Highly impact-resistant with built-in UV protection
- - High-index plastics: Thinner and lighter for stronger prescriptions
Refractive Index
The refractive index measures how efficiently a material bends light. A higher index results in a thinner lens for the same prescription.
Enhancements & Coatings
Anti-reflective (AR) Coating
Essential for high-index lenses, this improves visual clarity and reduces eye strain by eliminating distracting reflections.
UV & Tints
Protection can be built-in or added via tints (solid, gradient, or sunglass) to improve indoor comfort or outdoor protection.