You might have seen, read, or heard the word polarised and non-polarised sunglasses, but what are they? And how do polarised sunglasses help? If you are unsure, then this piece will help clear all your doubts.
Light and polarised sunglasses
Sunlight is the main source of light. When it reaches the surfaces of the earth it's absorbed, reflected and refracted in elements like water, glasses and other surfaces. Once the light is reflected it travels in a horizontal direction and enters the eyes. This cause visual discomfort, irritation and sometimes even temporary blindness. This situation can be avoided with polarised sunglasses.
What does Polarised Sunglasses mean?
Polarised sunglasses contain polarised lenses—or a film sandwiched in between the lens. They help cut through glare and add more detail to the image. The difference between polarised sunglasses lenses and standard lenses is in the special coating or film.
Advantages of Polarised sunglasses
- Help cut out harmful glare that might affect your vision and help a great deal while you are outside.
- They reduce visual discomfort, giving clearer vision, thus reducing eyestrain and cutting glare and reflection.
- All these qualities are missing in an unpolarised lens or in lower metrics.
- Shows colours properly.
Disadvantages of Polarised Sunglasses
- Polarised lenses make it difficult to view LCD screens. They create the effect of making the images on the screen disappear at certain angles.
- Glasses with polarised lenses are generally more expensive than regular lenses.
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Who Needs Polarised sunglasses?
People who work around or on the water, like fishermen and boaters must use polarised sunglasses. These sort of sunglasses reduce glare, which makes it easier for them to view deeper into the sea.
The difference is of night and day because a fisherman can accurately look at the souls of fish from above, while boatmen can watch out for things like underwater hurdles, and complex movement of underwater currents. This is why it’s ideal to carry a pair of polarised sunglasses when you are travelling to a place that has a beach.
Polarised sunglasses can aid in driving too. Especially during the summer. Horizontal rays of light are refracted from the road, increasing eye fatigue and discomfort. Polarised sunglasses reduced this glare.
It can also be good in places where the light keeps changing all the time, for instance, a forest. They will definitely help you cut the reflection out.
Are polarised sunglasses really useful?
In a nutshell, yes. They have solid benefits, and if you are someone who travels a lot or is outdoors all the time, a pair of polarised sunglasses is a much. The effects of UV light takes a while to show, but why wait when you can protect your eyes now?