Progressive lenses allow you to see clearly at all distances — near, intermediate, and far — without the visible lines of bifocals.
At CV Optical in San Francisco, progressive lenses are professionally measured and fitted in person to ensure precision, comfort, and smooth adaptation.
What Are Progressive Lenses?
Progressive lenses are multifocal lenses with a gradual transition between prescription strengths:
• Top portion → Distance vision
• Middle → Intermediate (computer)
• Bottom → Reading
Unlike bifocals, they provide seamless vision without a visible dividing line.
Why Proper Measurement Matters
Progressive lenses are extremely sensitive to measurement accuracy.
Key factors include:
• Pupillary distance
• Fitting height
• Frame depth
• Pantoscopic tilt
• Vertex distance
Even a 1–2mm error can cause distortion or difficulty adapting.
That’s why all progressive fittings at CV Optical are done in person by an experienced optician.
Corridor Length Explained
The corridor is the transition channel between distance and reading areas.
Short corridor
• Designed for smaller frames
• Faster transition between zones
Long corridor
• Smoother visual transition
• More comfortable for larger frames
Choosing the correct corridor depends on frame size and lifestyle needs.
Choosing the Right Lens Material
Progressive lenses can be made in different materials.
Polycarbonate (1.59)
Best for:
• Impact resistance
• Lightweight comfort
• Rimless or drill-mount frames
However, polycarbonate has a lower Abbe value, meaning slightly more chromatic aberration.
1.60 High Index
Best for:
• Mild to moderate prescriptions
• Balanced clarity and thinness
Offers improved cosmetics compared to polycarbonate for stronger prescriptions.
1.67 High Index
Best for:
• Strong prescriptions
• Reduced edge thickness
• Cleaner cosmetic appearance
For prescriptions above -4.00, 1.67 is typically recommended to reduce bulk while maintaining visual performance.
Premium vs Standard Progressive Designs
Standard Progressive Lenses
• Narrower reading area
• More peripheral distortion
Premium Progressive Lenses
• Wider intermediate zone
• Reduced “swim” effect
• More natural head movement
Premium designs are especially beneficial for professionals using computers extensively.
Frame Selection & Progressive Performance
Progressive lenses require adequate vertical depth.
Shallow frames may limit:
• Reading area size
• Smooth transition zone
Frame choice directly affects lens performance.
Adaptation Period
Most patients adapt within 7–14 days.
Proper frame adjustment — including pantoscopic tilt and alignment — significantly improves adaptation.
If needed, minor adjustments can improve comfort during the transition period.
Can You Use Your Existing Frames?
Yes, provided:
• The frame is structurally sound
• There is enough vertical depth
• Accurate measurements can be taken
Each progressive lens must be custom-measured for the individual wearer and frame.
Why Choose CV Optical?
• Real optician measurements
• On-site lens finishing available
• Precision-focused fitting process
Progressive lenses are only as good as their measurements. Precision matters.
Book Your Progressive Lenses Fitting in San Francisco
All progressive fittings are performed in person at CV Optical in San Francisco’s Financial District.
If you’re ready for seamless vision at every distance, book your progressive lens fitting today.