Fit Tip: Dual-Strength frames are grouped by face width — Narrow, Average, Wide, and Extra Wide. If most glasses feel snug at the temples, try the Wide or Extra Wide section. If your frames often slip or feel loose, start with Narrow. Not sure? Average works well for most faces.
Dual-Strength Bifocal
Two Powers, One Pair – Seamless Vision for Every Task
Custom Dual-Strength Bifocal Readers Made Just for You
At DebSpecs, we’ve reimagined bifocal readers with the help of expert opticians to create our exclusive Dual-Strength Collection — custom-made glasses that deliver crisp computer and reading vision in one effortless pair.
Key Benefits
- • Distinct magnification zones in the upper and lower halves of each lens
- • Clear vision for reading, computer work, and relaxed mid-distance
- • No more switching between multiple pairs
- • Seamless vision wherever life takes you
Scroll down to shop Dual-Strength frames ↓
Each pair is custom-built to your power combination for everyday comfort and clarity.
Custom builds typically ship within 3–5 business days.
How to Choose Your Strengths
Choosing your powers is easier than it sounds. Here’s a simple way to think about it:
Step 1 – Start with what you already wear.
If you use two pairs today — one for the computer and one for reading — those are the same two strengths you’ll use in your Dual-Strength lenses: computer power on top, reading power on the bottom.
If you currently wear just one pair of readers, use that strength as your bottom (reading) power.
Step 2 – Choose a milder power for the top.
The top of the lens is made for computer and mid-range (arm’s-length) vision, so it should be weaker than your reading strength — similar to your “computer pair” if you already use one.
Step 3 – Why the difference matters.
Dual-Strength lenses work best when the top is at least 1.00 diopter weaker than the bottom.
This creates a smooth, comfortable transition from computer distance to close-up reading — without eye strain.
Step 4 – Fine-tune for your daily habits.
If you spend more time on the computer than reading, choose a gentler top power for relaxed, sustained clarity.
Here are a few example combinations that follow the required 1.00 diopter difference and offer smooth dual-distance clarity:
| Your usual readers | Suggested top (computer) | Suggested bottom (reading) |
|---|---|---|
| +2.50 | +1.50 | +2.50 |
| +3.00 | +2.00 | +3.00 |
| +3.50 | +2.50 | +3.50 |
| +4.00 | +3.00 | +4.00 |
Choose your frame style below
Your custom lenses are crafted once you select your powers on the product page.
Shop Dual-Strength Bifocal Frames
Choose the frame style you love, then select your power combination on the product page.
1. Choose Frame
2. Choose Powers
3. Enjoy Seamless Vision
