Standard 01
Kyunglas — Active Set
$199.95
Kyunglas — Active Set
$199.95
KYUNGLAS ACTIVE
Light Changes. Your Lens Can Too.
Photochromic lenses that change with UV exposure — lighter when UV is low, darker as UV gets stronger.
Active — Photochromic. Light to smoke.Active Pro — Photochromic + Rose Gold mirror.
KYUNGLAS fit developed through 1,000+ dog fittings
Outdoor UV Levels Change During the Day.
Open SunShadeCloudy ConditionsChanging Outdoor UV
Outdoor UV conditions can change during the same day. A fixed-tint lens keeps the same tint. Active changes with UV exposure.
When Active Makes Sense
For Routines Where UV Exposure Changes
Changing outdoor UV during the day
Routes that move between more and less exposed areas
Owners who prefer a photochromic lens over one fixed tint
Active fits outdoor routines where UV exposure changes rather than staying constant — for owners who'd rather use one photochromic lens than choose a single fixed tint.
How Active Works
Light Changes. Your Lens Can Too.
UV-Responsive Tint
Lighter when UV is low, darker as UV exposure increases.
UV-Blocking Lens Material
UV-blocking material is built into the lens itself, not added only as a surface coating.
Fewer Lens Changes
One lens that changes with UV instead of staying at one fixed tint.
The Choice
Active or Active Pro?
Both are photochromic. The difference is the lens finish.
Active
TypePhotochromic
BehaviorLight → Smoke
FinishNo mirror coating
Choice reasonFor owners who prefer a clean, neutral photochromic lens.
Active Pro
TypePhotochromic + Rose Gold Mirror
BehaviorLight with subtle Rose Gold mirror → Darker with more visible mirror
FinishRose Gold mirror coating
Choice reasonFor owners who want photochromic function with a Rose Gold mirror finish.
Both use photochromic technology. Choose the lens finish you prefer.
The Kyunglas Standard
How the Lens Responds to UV
Good Lens Standard 01
How Photochromic Lenses Change
Photochromic lenses respond to UV exposure by changing tint.
Lower UV keeps the lens lighter; higher UV makes the lens darker.
Active and Active Pro share this photochromic response. The difference between them is the lens finish, not how the tint develops.
| Lens | How It Changes With UV |
|---|---|
| Active | Light → Smoke |
| Active Pro | Light + Rose Gold mirror → Darker + more visible mirror |
UV-Responsive Tint
Two Lens Finishes
Both Active and Active Pro use this photochromic response. Active Pro uses the same photochromic response with a Rose Gold mirror finish.
Small and Medium offer both Active and Active Pro, each with the full Color Lens pairing lineup. Large is available in White, Black, and Pink frames; Tulip Purple replaces the standard Purple lens option when pairing with a Color Lens.
Good Lens Standard 02
Performance Should Be Proven.
A good lens shouldn't be judged by a single test. Real protection has to perform under more than one condition.
Vision
UV Cut 400
UVA/UVB/UVC
Pass
Distortion
Center-line check
Pass
Surface Performance
Anti-Fog
Fog resistance
Pass
Hard Coat
Scratch resistance
Pass
Impact
High-Velocity
250 ft/s (~274 km/h)
Pass
High-Mass
500g / 1.3m drop
Pass
Environmental Durability
High Temp
+70°C, 6h
Pass
Low Temp
−25°C, 6h
Pass
Aging
Long-term stability
Pass
Storage
Material stability
Pass
Built on the ANSI criteria used for human protective eyewear and goggles — and tested even more rigorously across all 10 categories above.
1,000+dogs fitted
Realenvironments
A Dog's Face Isn't Flat.
Dog faces vary widely in width, muzzle length, and contour. That's why fit can't be solved with straps alone.
3 SizesAdjustable Strap7-Point FitFace-Contour Design
Find Your Dog's Fit.
Head circumference — quick guide, no guesswork.
SSmall
MMedium
LLarge
| Size | Head Circumference |
|---|---|
| S | 22–29cm / 8.7–11.4" |
| M | 30–38cm / 11.8–15.0" |
| L | 39–46cm / 15.4–18.1" |
Measure head circumference between the eyebrows and ears, closer to the eyebrows, using a soft tape measure.
Falling within a size range is a starting point — fit can still vary by eye spacing and muzzle shape.
Small and Medium offer both Active and Active Pro, each with the full Color Lens pairing lineup. Large is available in White, Black, and Pink frames; Tulip Purple replaces the standard Purple lens option when pairing with a Color Lens.
Getting Used to Kyunglas
New gear takes time, and adjustment varies by dog.
Short indoor sessions
Pair with treats
Positive association
Link to a walk they love
Compare the Lens Options
Clear
TypeClear lens
Color
TypeFixed tint
Active
TypePhotochromic — Light → Smoke
Active Pro
TypePhotochromic + Rose Gold Mirror
Clear is a clear lens. Color is a fixed tint. Active and Active Pro are both photochromic, with different lens finishes.
Frequently Asked Questions
What is a photochromic lens?
Photochromic lenses change tint with UV exposure — lighter when UV is low, darker as UV increases.
What is the difference between Active and Active Pro?
Both are photochromic. Active changes from light to smoke. Active Pro adds a Rose Gold mirror finish that becomes more visible as the lens darkens.
Is Active Pro stronger than Active?
No. The main difference is the Rose Gold mirror finish.
Does the lens change indoors or inside a car?
Photochromic lenses respond to UV exposure, so tint change may be limited indoors or inside a car where UV exposure is lower.
Can I add a Color Lens?
Yes. Active and Active Pro can each be paired with a Color Lens via Set Configuration.
Which should I choose?
Choose Active for a neutral photochromic lens. Choose Active Pro if you want the same photochromic function with a Rose Gold mirror finish.
Worldwide ShippingTo most countries
Size / Return SupportFit guidance before & after
Customer SupportReal answers, real people
Light Changes. Your Lens Can Too.
Choose Active or Active Pro based on the lens finish you prefer.
Find Your Dog's Size