Sunglasses Shopping Guide
There is a world of difference in the price of sunglasses. Besides the brand determining the price, there is also the material of the lenses.Lenses affect optical transparency, weight, durability and cost.Choose sunglasses to spend wisely, too.
1.Polycarbonate material: it blocks 100% of the UV rays by itself, no lens coating required.Good impact resistance and transparency, second only to polyurethane.It is cheap, light and not friction-resistant, so it needs to be coated.
2.Polyurethane material: maximum impact resistance, best optical transparency.Flexible, light and expensive.
1.Metal frames: stainless steel, aluminum alloy and ultra-expensive titanium alloy.Very light, but not suitable for high intensity sports.Metal-rimmed sunglasses are cool and stylish, but sporting them is a bit different.In the hot summer months, sunglasses and metal frames placed in your car can become too hot to wear right away.
2.Nylon frames: Inexpensive, lightweight and more durable than metal frames.A lot of goggles, sport sunglasses use nylon material, the radian of nylon picture frame cannot adjust commonly, unless frame has steel core inside.
3.Acetate frame: Expensive, lightweight, versatile in color, malleable, not suitable for sports wear.
Visible light penetration of sunglasses
As the saying goes, shades of color, look below, you will find that the same color sunglasses have different shades, this performance is called visible light penetration, there are 0-4 levels.The weather and location are different for different shades: level 0, indoors or cloudy;Level 1-2, medium to low light sun, sun protection for driving and city life, fashion sunglasses belong to this category;Most sunglasses are level 3, worn when in strong light (seaside, mountaineering);4. Extremely strong sunlight (snow mountain, desert, mountain, water edge), cannot be worn when driving or cycling, the vision is too dark.
The lens color of sunglasses
Depending on the weather, choose the following:
Note that sunglasses for exercise are specially designed, with non-slip nose pads that fit better, and wraparound frames that block reflections from the side.Baby sunglasses can be brown or gray in color. Gray lenses provide a more natural visual quality, but brown lenses filter out harmful short-wavelength blue light. I personally would recommend brown.
