3 Simple Ways to Identify Authentic UV400 Polarized Glasses

There’s an excellent solution for this problem:Polarized sunglassesThese glasses with special layers filter out harmful light. Wearing polarized glasses improves your vision and protects your eyes from fatigue caused by too much light.

If you are planning to buy apolarized glassesyou should be careful because some may sell you counterfeit versions instead of real ones. But don’t worry,there are three simple ways to identify genuine polarized sunglasses from fake onesthat help you shop with confidence.

Methods to Verify if Sunglasses Are Polarized

When you want to buy ahigh-quality sunglassesit’s important to make sure the lenses are truly polarized. The “Polarized” label on the lens doesn’t always mean the feature is real. Here, we review three reliable methods with explanations and examples.

1. LCD Screen Test

Polarized lens filters block horizontal reflected light. This feature causes part of the light to be blocked when you look at an LCD screen and rotate the glasses.
How to do it:Hold the glasses in front of your mobile phone or laptop screen and slowly rotate them from horizontal to vertical.
At an angle of about 60 to 90 degrees, the image will darken significantly or turn black.
Real-life example:Suppose you’re using your phone at home. When you hold the glasses in front of the screen and turn them slightly, the screen suddenly darkens—that means the lens is polarized.

2. Reflection Test on a Shiny Surface Outdoors

Sunlight reflecting off smooth and shiny surfaces creates annoying reflections called glare. Polarized lenses eliminate these reflections.
How to do it:Look at a bright, reflective surface like water, car windows, or a wet road. Without glasses and then through polarized glasses, reflections fade and surface details become clearer.

3. Using Two Polarized Glasses

When two polarized filters are overlaid and one is rotated, light transmission reaches a minimum.
How to do it:Stack two polarized glasses and rotate one. At a 90-degree angle, the view will become almost completely dark.
Real-life example:In an eyewear store, place a new glass over your polarized glasses and rotate it. If the view darkens, both are polarized.

Advantages of Polarized Glasses

Polarized glassesUse special optical filters to significantly improve visibility in difficult lighting conditions and reduce:

1. Severe glare (glare) and eye strain:Reflections from flat, shiny surfaces like water, wet asphalt, or car windows cause eye discomfort and reduce focus. Polarized filters block these horizontal reflections, providing a calmer view.
2. Sharper image clarity and more detail:
   Removing annoying light, details in the environment become clearer. This is especially useful for drivers or anglers needing precise vision.
3. More natural color display without darkening or fading:
   Polarized filters show colors more vividly and prevent color tone shift seen in some normal glasses.
4. Reducing fatigue and eye pressure during prolonged use:
   Long exposure to bright light strains the eye muscles. Polarized glasses reduce glare, easing eye pressure.
5. Enhanced safety in driving, sports, and outdoor activities:
   Clearer vision and less reflection help you react faster and reduce the risk of accidents, especially when driving in bright sun or skiing on snow.

Difference Between Polarized and UV400 Glasses

At first glance, you might think “Polarized” and “UV400” are similar or that a polarized glass always has UV protection. But in reality,they serve different functions and purposesand even a single pair may only have one of these features.

Differences in Function and Purpose

• Polarized glasses:
  Their main focus is onreducing annoying glare (Glare).This glare occurs when sunlight reflects off smooth surfaces like water, glass, or wet roads. Polarized lenses have special filters that allow only useful light to pass through and block horizontal reflected light. This results in clearer vision, truer colors, and less eye fatigue.
• UV400 glasses:
  Their main goal is toprotect eyes from ultraviolet rays (UV)by blocking all harmful UVA and UVB rays up to a wavelength of 400 nanometers. This feature is mainly for health protection, preventing issues like cataracts, early eye aging, and retinal damage.

Differences in Impact on Vision

• Polarized:Improves visual sharpness, shows more natural colors, and provides greater comfort in bright environments.
• UV400:Does not directly change image quality but protects the eyes from long-term damage.

Combination of Both Features

A single pair of glasses can be both polarized and have UV400 protection, but these are separate features. Having one does not automatically mean the other is present. For example, some glasses might be UV400 but not polarized, or polarized without complete UV protection.