Dual Strength Bifocal - The Card Shark
Dual Strength Bifocal - The Card Shark
Stop switching between two pairs of reading glasses.
Experience vision that adapts to your day with Debby Burk Optical's Dual-Strength / Dual-Power bifocal design, created for people who shift between tasks without slowing down. The Card Shark pairs a sleek rectangular frame with clean lines and modern angles, bringing professional polish to reading, screen work, and everything in between.
Seamless Clarity with Dual-Strength Bifocal Technology
Debby Burk Optical 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.
Available as Reading Glasses or Sunglasses
The Card Shark comes in two lens types: Clear Reading Glasses for indoor use, or full Sunglasses for the same dual-strength clarity outdoors. Choose the one that fits your day, or get both to cover every setting.
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
Designed to Fit: Choose Your Size
| Size | Eye Size | Bridge | Temple | Frame Height | Frame Width |
|---|---|---|---|---|---|
| Average | 53 mm (2.09 in) | 17 mm (0.67 in) | 140 mm (5.51 in) | 36.8 mm (1.45 in) | 128 mm (5.04 in) |
| Wide | 56 mm (2.20 in) | 17 mm (0.67 in) | 145 mm (5.71 in) | 39.8 mm (1.57 in) | 134 mm (5.28 in) |
Color Options
- Shiny Black: Classic, bold, and effortlessly refined for any setting.
- Shiny Crystal: Fresh, modern clarity with a sleek, minimalist vibe.
- Shiny Gray/Matte Black: A two-tone finish with a sharp, contemporary edge.
- Shiny Tortoise: Warm, textured styling that softens the rectangle shape.
Choosing Your Strength
Start with the readers you already wear as your bottom (reading) power, then choose a milder top power for computer and mid-range vision, ideally at least 1.00 diopter weaker than the bottom, for a smooth, comfortable transition without eye strain. If you spend more time on screens than reading, lean toward a gentler top power.
Available in 17 precise strength combinations from Top .50 / Bottom 1.50 up to Top 2.00 / Bottom 3.50.
Where The Card Shark Works Best
- Anyone who currently juggles two pairs of readers, one for the computer, one for close work
- Desk work that shifts constantly between screen and paper
- Reading, crafting, fine print, and detailed paperwork
- Anyone who found progressives too narrow a field of view
- Indoor and outdoor use, with both reading glass and sunglass lens options
Why People Upgrade to The Card Shark
- Two magnification zones in one lens, no more swapping glasses
- No visible line, no distortion, just a smooth transition between zones
- Available as clear readers or full sunglasses
- Two sizes, Average and Wide, for a more precise fit
- Custom-made to your exact top and bottom strength
- Reinforced, spring-hinge construction built for all-day wear
Shipping & Production
Each pair is custom made to your exact top and bottom strength, then individually inspected. Orders typically ship within 4-5 business days.