Summer arrived, how should choose your sun glasses?
Although many people like the sun glasses, but they choose and buy when not so good as to buy other things.
Many people buy is not a good lens, and just for the sake of a beautiful picture frame or fashion.
Really need the sun glasses?
How important is the color of the lens?
How the size of the lenses and frames, and so on, there is also a lot of knowledge.
The optometry optometrists and ophthalmologists agree that answers to these questions to see your eyes, and how do you use sun glasses.
Really need the sun glasses?
Normal eyes can adjust yourself to the light.
Colored glasses main reason is that eyes feel uncomfortable, long-term work strong sunlight exposure and damage to the eyes.
'The ability to tolerate light each different.
False if you want to squinting in the hot sun or often shed tears, then you should wear sunglasses.
'An eye doctor said such advice.
Light hurt eyes shine.
A person often activity in the hot sun, half will reduce his night vision in the night, so if it is a long walk or should wear sunglasses on the beach.
How to pick up the lens?
Sun glasses suction light, polarized light, coating and photosensitive discoloration.
The best lens is polished with optical applications, just like doctors formula of glasses.
The plastic lenses, like glass, quality has very big difference.
Plastic is lighter, usually not broken, cheap;
Can be easily scratched, so be careful when you touch the lens or decontamination.
Inspection lenses are a few simple way: in the light of the light observation, the lens should be completely clear, no cross scratches, striped heart loops, bubble and stain.
The lens from top to bottom and move around to observe line clear object, such as window frame, door frames, if they are shaken, deformation, then the lens is a distortion.
This lens can't use.
Check whether the lens color is even, can look for the two pieces of lens color is different, and position of the two lenses are gradually becomes shallow depth is the same.
What color is the best?
'Smoke' is natural pure and gray color is best.
The color of the lens is the most difficult to manufacture, so inferior glasses will not use this color.
The second is green.
Blue and red lens only in some industrial applications used on the road.
The special lenses and yellow.
So the lens color depends on purpose.
How deep of color should be?
The deepest color suitable for use in bright light, as if in a tone of driving on the road, it is very dangerous, many people buy the glasses in the brightly lit shop was very appropriate, to the beach or outside is too shallow.
Is the best way to take glasses to look for the sun on the street, under the bright light was only thirty percent through the two light is advisable.
Clip on the lens share?
By the way, some people put the color in the front of the lens in prescription glasses, do the edge of the lens cover less than, can produce more glare, followed by more add a pair of mirror, increased the face and back to the light reflection on the lens, not easy to see clearly the size of the plate and frame the how goes it?
Many sunglasses lens is too small, shade surface is not big enough.
Can QuCheng circle with your fingers, when buy, surround the lens and see if I can change the vision, if there is any change is the lens shade is not big enough, the mirror after wear, eye pupil is in the middle of the lens.
Don't buy too wide on either side mirror arm, lest hinder next to the line of sight.