Who needs computer glasses?
Blue light radiation from computer screens and so on usually only requires a piece of fiberglass to block, usually, we just use the anti-radiation glasses. Office white-collar workers often spend more than 8 hours a day working in front of a computer, and sometimes they spend their entertainment with a computer after going home. After long, the eye often can feel dry, sour bilge, ache, shed tears even, giddy. These are all related to the blue light stimulus emitted by the screen.
Two Tone Glasses Tortoise and Light Yellow
The rectangular two tone glasses provides additional flexibility and comfort with its innovative design, which is especially designed for men. Two tones, the tortoise in the upper part and the khaki in the bottom part. The high-quality acetate makes it luxurious and durable, while the unique finish adds a stylish touch to the frame. In this way, the intricate details can show some extra style while still being perfectly suitable for everyday wear.
The Advantages of Aspheric Lenses
From the above, you have learned some basic information about aspheric lenses. In this section, we will show you some advantages of the aspherical lens. Apart from the style of aspheric lenses, most people choose them because the following reasons:
- Improved performance
- Spherical aberration correction
- Slimmer and thinner profile
- More frame options
- Improved image quality
- Sleeker profile
- Lightweight and comfortable
- More natural appearance
- Improved peripheral vision
- Multiple lens designs to choose from
So, aspheric lenses come at a lot of advantages. However, everything has two sides. Hence, there are some negative voices of aspherical lens. Therefore, in the following section, we will show you the disadvantages of the aspheric lenses.
Sunglasses for Fishing under $50 - Purnyman
Purnyman holds the fashion, quality, high-grade brand concept and is committed to creating their unique brand personality style, cost-effective, PURNYMAN glasses are a few big brands in the price of the most advantageous, and it's polarized sunglasses, can not only see the float fishing especially clear but change color according to the outside world light automatically. It will not affect the sight of floating because of the sudden overcast.
Titanium alloys have low thermal elasticity
The thermal conductivity of titanium is about 1/4 of nickel, 1/5 of iron, 1/14 of aluminum, and the thermal conductivity of different titanium alloys is about 50% lower than that of titanium.
The elastic modulus of titanium alloy is about 1/2 that of steel, so its rigidity is poor and is easy to deform, and it is not suitable to make slender rods and thin wall parts. When cutting, the spring back of the processing surface is very large, about 2 ~ 3 times of stainless steel, resulting in severe friction, adhesion, and bonding wear of the knife surface.
Blue light in natural light
Blue light is not the unique light emitted by electronic products, but the visible light that exists in natural light, usually with a wavelength of about 400-500nm. The blue light in the entire waveband can be subdivided into two parts. One part will cause optical damage to the retina of the eye and accelerate the oxidative senescence of cells in the macular area of the retina. Usually, the wavelength of this part of blue light is between 415-450nm, and its damage to the eyes is gradually accumulated and formed. There is also a part of blue light that is beneficial to our human body, that is, blue light with a wavelength of about 480nm. It can adjust biological rhythms and is helpful for sleep, mood, and memory. In addition, experiments have confirmed that daily outdoor activities in the sun can effectively prevent the occurrence of myopia, and short-wavelength blue light may play an important role.
Always wear or take off glasses with both hands.
Because there is no protection of the lenses ring, it is only supported by two temples. When taking off and wearing, it should be carried out with both hands, holding the temples of the frame and gently. Using only one hand will destroy the balance of the left and right temple, easy to produce deformation of the frame.
