Some Sunglasses Recommendations

Some Sunglasses Recommendations

phthalmologists suggest that sunglasses must be worn frequently to protect the eyes; this is because our eyeball (lens) is very easy to absorb ultraviolet rays, and the damage of ultraviolet rays has two prominent characteristics: 1. The damage of ultraviolet rays will accumulate. Since ultraviolet light is invisible light, it is difficult for people to perceive it intuitively.
2. The damage of ultraviolet rays to the eyes is irreversible, that is, irreparable. Such as: cataract surgery can only be replaced by intraocular lenses. Long-term damage to the eye can easily lead to damage to the cornea and retina, clouding of the lens until cataract occurs, resulting in permanent visual damage.
Since the damage of ultraviolet rays to the eyes is invisible, it cannot be felt immediately. If you don’t wear glasses, you will not feel particularly uncomfortable. It just means that your eyes are not very sensitive to visible light (such as dazzling glare, glare, and reflected light). , and cannot avoid UV damage.
Does the darker the sunglasses, the better the UV blocking effect?
No, the function of the lens to block ultraviolet rays is that it is treated by a special process (adding UV powder) during the manufacturing process, so that the lens can absorb harmful light below 400NM such as ultraviolet rays when the light penetrates. It has nothing to do with the depth of the film.
The benefits of polarized lensesEdit Broadcast
Glare occurs when light is partially polarized when reflected off the surface of an object. The negative effect of glare enhances brightness and weakens color saturation; it blurs the outline of objects, and makes eyes tired and uncomfortable. The polarizer is made according to the principle of polarization of light. It has a unique function of limited glare elimination, making the vision clearer and more natural. It has a special effect on the driver, which can improve the vision and increase the driving pleasure.
Identifying the quality of glasses
Look at the glasses first
1. The color of electroplating, paint coating, plate surface polishing and other surfaces is uniform, without obvious flaws, spots and scratches.
2. The printing, laser and engraving strokes of lenses and temples are clear and smooth, easy to identify and not easy to fall off.
3. The color of the lens is correct, there is no chromatic aberration scratches and bubbles, the color of the progressive film is too natural, and the color of the left and right lenses is symmetrical.
4. The feet with the glasses in hand are facing the fluorescent light, so that the reflective strips on the mirror surface move smoothly, and the fluorescent light shadow will not appear wavy or distorted, indicating that the lens has no stress.
Look at the packaging and origin description
Good glasses have a complete package, tag or manual. The tag, product code and instruction manual have product descriptions, industry quality standards and detailed dealer or manufacturer contact content.
last try
Good glasses have clear and real vision, comfortable to wear, and no pressure on the bridge of the nose, temples, ears, etc. Fine workmanship, smooth and delicate hand feel, smooth and natural lines.
Causes of dizzinessEdit Broadcast
Causes of dizziness when wearing glasses
Prism degree exceeded
Prism degree is the distance from the lens to the object, which is 100 times the lens power of the image point on the object, that is, the ratio of the deviation distance of the imaging point to the distance from the object to the lens is expressed in cm/m, including two indicators: the vertical meridian of the paired lens. The difference does not exceed 0.25cm/m, and the difference between the horizontal meridians does not exceed 0.75 cm/m: if any index of the two lenses of a pair of glasses exceeds this standard, it will make people feel that the eyes are swollen.
Spherical excess
The spherical power is the average value of the optical power of the two main meridians of the lens︱D1+D2︱÷2, and the standard is within ±0.12mm. If it exceeds this standard, it will make people feel dizzy.
Excessive astigmatism
Astigmatism is the absolute difference between the two main meridian optical powers of the lens︱D1-D2︱. The standard should be greater than 0.12mm. If it exceeds this standard, it will make people feel dizzy. Because the above three indicators of the lens below 6 bends (abbreviated as 6C) are relatively stable and not easy to exceed the standard, the optical processing difficulty increases exponentially if it exceeds 6C, and the curvature of the lens is over 8C.
Smart Sunglasses Editor Broadcast
Sunglasses controlled by computer chips can automatically sense changes in the intensity of sunlight and respond in 0.1 seconds. When entering the dark, they become flat mirrors, allowing the wearer to always be in the most comfortable visual state. Let driver friends always be in safety.
Monocle editor broadcast
The oldest glasses in China are round monocles made of crystal or transparent minerals.
In the Ming Dynasty, Western glasses were introduced to my country through the Western Regions or the South Ocean. Wu Kuan wrote a poem to thank him after receiving the glasses from his friends. Near the eye socket”, the monocle is also called “single photo”, “the single lighting has existed, and the old legend is the Western legacy.” (“Suzhou Prefecture Chronicle”)
Color-changing glasses editor broadcast
Sunglasses
Sunglasses
Many car drivers often wear a pair of black glasses while driving. When driving in the sun or on snowy days, these black glasses protect the eyes from prolonged stimulation by strong light. However, when the car suddenly drove from a bright place to a dark place, wearing black glasses became a burden. Wearing it for a while and taking it off for a while is really inconvenient. Is there any good way to relieve the driver of this distress? have. Wear color-changing glasses. In the sun, it is a pair of black sunglasses, with thick black glass lenses blocking the dazzling light. In a room with soft light, it becomes transparent and colorless like ordinary glasses again.
The mystery of color-changing glasses is in the glass. This special glass is called “photochromic” glass. In the manufacturing process, it is pre-doped with light-sensitive substances, such as silver chloride, silver bromide (collectively referred to as silver halide), etc., as well as a small amount of copper oxide catalyst. The spectacle lenses change from no color to light gray and dark brown, and then from black glasses to sound-tone glasses, all of which are magic of silver halide.” In the glass of color-changing glasses, there is a change very similar to the exposure image of photosensitive film. Process. Silver halide is decomposed by light and becomes many black silver particles, which are evenly distributed in the glass, so the glass lens appears dim and blocks the passage of light, which is black glasses. However, it is different from the situation on photosensitive film. , the silver atoms and halogen atoms generated by the decomposition of silver halide are still closely together. When returning to a slightly darker place, under the promotion of copper oxide catalyst, silver and halogen recombine to form silver halide, glass lens became transparent again.
Silver halide resides in glass, and the reactions of decomposition and combination are repeated endlessly. Photo film and printing paper can only be used once, but color-changing glasses can be used forever. Color-changing glasses can not only darken and brighten with the intensity of light, but also absorb ultraviolet rays that are harmful to human eyes. They are indeed the top quality glasses. If the window glass is replaced with photochromic glass, on sunny days, the sunlight will not penetrate into the room; on cloudy days or in the morning or dusk, the outdoor light will not be blocked, and the interior will still be bright. It’s as if the windows were hung with automatic shades. In some high-end hotels and restaurants, color-changing glass has been installed. The cab of the car and the window of the tour bus are equipped with this kind of photochromic glass. In direct sunlight, you don’t even need to wear color-changing glasses. The car has always maintained a soft light to avoid dazzling sunlight and exposure. Everyone should be What a joy!

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