Dual Strength Bifocal - The Card Shark

$139.95 $89.95

Ships in 4–5 business days (Custom Lab Production).

Stop Switching Between Two Pairs of Reading Glasses

Dual-strength lenses let you read up close and see clearly at arm’s length — without changing glasses.

  • Two viewing zones in one pair
  • Designed for extended reading comfort
  • Available in precise strengths

How to Choose Your Strengths

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: computer power on top, reading power on the bottom. If you wear just one pair, use that strength as your bottom (reading) power.
Step 2 – Choose a milder power for the top. The top of the lens is for computer and mid-range (arm's-length) vision, so it should be weaker than your reading strength.
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.
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
$139.95 $89.95
Buy One Dual Bifocal Get 25% Off 2nd Pair
No Coupon Code Required —
Just Add To Cart

Everyday Vision with a Competitive Edge
Meet The Card Shark, a sleek rectangular frame designed for readers who appreciate clean
lines, modern angles, and practical comfort. With its versatile sizing and lightweight build, this frame brings professional polish to your daily reading routine. Whether you're scanning documents, multitasking at work, or enjoying your favorite book, this design delivers clarity and style in equal measure.

Seamless Clarity with Dual-Strength Bifocal Technology
DebSpecs’ dual-strength bifocal lenses make shifting between tasks effortless.

Upper Zone – Intermediate / Screen Vision
• Softer magnification for computer use, meetings, and mid-range viewing
• Reduces eye fatigue during extended screen time

Lower Zone – Near / Reading Vision
• Stronger magnification for up-close clarity
• Ideal for reading, crafting, fine details, labels, and paperwork
Smooth transitions – no visible line, no interruptions.

Lightweight Plastic with Everyday Comfort
• Sleek rectangular silhouette for modern versatility
• Lightweight plastic frame suitable for long hours of wear
• Comfortable temple design for a secure, stable fit
• Available in two size options to accommodate more face widths

Fit & Measurements
Lens Width: 53 mm or 56 mm
Bridge: 17 mm
Temple Length: 140 mm or 145 mm
Face Width:
• Average – 125 mm
• Wide – 131 mm

45-Day Comfort Guarantee: If the size or strength isn't right, we’ll exchange them for free.

We will gladly refund any returns that are postmarked for return within 30 days of original purchase date.

Beyond 30 days, we will issue a store credit. Please note: Regardless of timing returns for customized optical quality lenses will incur a 15% restocking fee

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DebSpecs Shelby Main eyewear

Dual Strength Bifocal - The Card Shark

$139.95 $89.95
$139.95 $89.95

Why Traditional Readers Fall Short

Most Readers Are Designed for One Distance - Real LIfe is Not

You can’t see everything clearly at once

Your book is sharp, but your screen isn’t.

Why it happens:Traditional readers focus at only one fixed distance.
Result:You lean forward, tilt your head, or constantly adjust.

You keep switching glasses

On. Off. Swap pairs. Repeat.

Why it happens: Standard lenses aren’t built for how people actually move between tasks.
Result: You now manage two pairs of reading glasses to navigate your day.

Your eyes feel tired too soon

By afternoon, your eyes feel strained.

Why it happens:Your eyes compensate when lenses don’t match real working distances.
Result: Fatigue, tension, and reduced comfort.





Custom-built in partnership with experienced opticians —designed to fit the way you actually use your vision.

Switch Tasks, Not Glasses — How It Works

Will These Work For Me?

Perfect for you if:

  • ✓ You read, scroll, and look up throughout the day
  • ✓ You switch between phone, laptop, and conversation
  • ✓ You want predictable clarity without progressive distortion

Not ideal if:

  • ✕ You want full-distance prescription lenses
  • ✕ You rarely switch focal ranges
  • ✕ You already love your progressives

Not All Reading Glasses Are Created Equal

DebSpecs Readers Drugstore Readers
Dual-Strength Viewing ✅ Near + Intermediate vision ❌ Single distance only
Optical Clarity ✅ Distortion-free lenses ⚠️ Blurry edges & warping
Comfort Fit ✅ Spring hinges + balanced weight ❌ Pinch or slide
Strength Accuracy ✅ Precisely calibrated lenses ⚠️ Often inconsistent
All-Day Wear ✅ Designed for extended reading ❌ Meant for quick use
Durability ✅ Reinforced frames ❌ Easily break or loosen
Style ✅ Designed for real life & confidence ❌ Disposable look
Eye Comfort ✅ Reduced strain & fatigue ❌ Eyes work harder
Cost Over Time ✅ One pair lasts months/years ❌ Replace repeatedly

FAQs

Dual-Strength readers use two magnification zones in a single lens — a milder power on top for computer and mid-range, and a stronger power on the bottom for close-up reading.

Yes. Each pair is made to order using the exact top and bottom magnification powers you choose.

For many customers, yes. Dual-Strength lenses provide clearly defined zones so you can move between computer and reading tasks without switching pairs.

If something feels off, it’s usually a small adjustment to the top power. Our team can help fine-tune your selection.



Yes — they’re designed for extended reading and computer use without constant switching.





You’ll see an estimated delivery window at checkout, and tracking details are emailed once your order ships.

  • 5 stars: 8 (73%)
  • 4 stars: 3 (27%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
K
Kelly Webster
Dual Strength Bifocal - The Card Shark

I would give these a 5 star rating except for one thing, and it's no ones fault. I need a 1.5 on top and a 2.75 on bottom, but no one seems to make that. So I got a 1.5 on top and a 2.5 on bottom, and unfortunately the .5 difference is very noticeable. Otherwise I really love these glasses. They're stylish and well made. Shipping was earlier than expected and the case included is great. If I can ever find someone to do a 1.5/2.75 I will gladly give them 5+ stars.

A
Angelia Majewski
Dual bifocal readers

I think if more people knew about these they would love them. They help my computer and also my paperwork become clear. I use a lower strength on the top and higher on lower and it works wonderfully

s
shelby lacouture
Fantastic!

I'm an electrical engineer and spend much of my time switching my gaze between a large monitor and reading material on my desk, and since I am far-sighted, this means switching between two different strength reading glasses. For quite some time now I've looked for readers with different magnifications to no avail. I've tried progressives which have a very small field of view (an extreme case of foveated view), and can not tolerate this. I don't remember how I stumbled on these card sharks, but I'm very glad I did; these are worth their weight in gold to me; no more swapping glasses repeatedly. Quality is fantastic as well. Good job Debbie Burke!!

R
Ralph Blair
Dual Strength Bifocal

I spend a lot of time on computer while doing paperwork, Dual strength bifocals allowed me to stop having to switch glasses each time i went from cpu screen to paper documents. Great product that met my needs.

E
Edward Luczak
Perfect for my needs

I am constantly struggling with the need for 2 different OTC readers. One for close up and one for my computer. My optometrist could only supply these with plain glass at the top and the 2 reading powers sharing the bottom half of the frame. Gave me headaches as the area I had to focus on was very thin. After much searching I found these. The Card Shark Dual Strength Bifocal is perfect. Top half is for reading my computer, the bottom half is for papers or phone or similar. So glad I found them. No more carrying around multiple reading glasses.

the lens is of good quality, the frames are solid and the wider frame fits me head perfectly not leaaving me with imprints along my temple. These are a must have is you want simples dual power readers.

G
Guy Keith Farrar
dual strength bifocal

These glasses are great!! They provide a clear vision for both powers. The quality is excellent.

M
Mike G
perfect for work at home

Just what I needed. Works perfectly. Now I don't have to switch between glasses .

D
DRH
Nice glasses for folks who feel....

Nice glasses for folks who feel cheated when they go to the fancy eye places. These work well. with good optical quality. My only suggestion would be for a little less yellow intensity on the tint option.

M
MKG
works for me

Works for me. Perfect for working at my computer. I got the 1.50/2.50. I just wish there was an extra wide option.

T
Todd
Work great

I don't need two different strengh glasses, one pair for reading computer screen and reading close up for books etc. Really like them.

D
DWP
Great but did not work for me. Your milage may vary. Worth a look.

These are just want I needed post-cataract surgery. The folks here were helpful and shipping was fast. Sadly, the placement of the bifocal insert was just too low for my needs and I found myself looking through the top line much of the time. This will vary by individual so it may work fine for you. It is worth trying out! And the refund was swift and easy! Cheers