According to official statistics, the probability of eye diseases among students aged 7-12, 13-15 and 16-18 in China is 45.71%, 74.36% and 83.28%, respectively. The incidence of eye diseases in adolescents has surpassed Japan to become the world's largest country. People generally classify the reasons as two aspects. First, the children's homework is stressful, excessive use of the eyes, the incorrect sitting posture also accelerates the damage to the eyes; the second is the long-term opposition to electronic products such as mobile phones and tablet computers. Two factors have caused eye fatigue in adolescents, resulting in decreased eye regulation, which in turn induces eye diseases. However, is this really the only thing? Last year, a World Health Organization (WHO) Eye Association's research report went on the go. The report pointed out that "the potential hidden threat of blue light hazard to humans will far exceed the destructiveness of Sudan red, melamine, SARS, H1N1, invisible. In the eyes of people. Although, this so-called WHO research report has been confirmed as false news. But the term blue light hazard has entered the public's sight. So, does the "blue light hazard" have any harm to the eyes and how much damage? We are here today to restore the truth to the facts. First, let's explore the first question. Does Blu-ray really hurt the eyes? The following is the answer to this question in the CIE S 009/E:2012 study published by the International Commission on Illumination CIE in 2002: The effect is that blue light can cause photochemical damage to the retina, mainly concentrated in the epidermal cells of the retinal pigment, and forms arcs and blind spots on the retina. Figure 2 Human eye structure What do you mean? The reason why the eye can see things is because there are rods and cones on the retina. There is a place in the axial end of the retina called the fovea. This is the area with the most acute vision and the most abundant visual cells. And it appears yellow because it is rich in lutein. Under normal circumstances, the aging of the macula with age increases visual decline. However, under the long-term exposure to blue light, excessive blue light directly enters the retina and generates a large amount of free radicals, which causes accelerated oxidation of the macula. Eventually, the visual cells in the macula are largely killed, and the damage cannot be repaired by itself.
PREMIUM HSS-PM DRILLS
used for stainless steel, iron sheet, angle steel, copper and aluminum, etc. It is also suitable for wood, plastic and other software materials.
FEATURE:
OPT premium HSS-PM drills are used to machining for cast iron, non-ferrous Features you should know
Flexible in order quantity:
Samples can be provided before mass production, and MOQ can be discussed accordingly.
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ABOUT US :
We are specialize in manufacturing PCD diamond tools and Carbide tools. Our major product inclulde PCD Inserts , PCD Reamers , PCD End Mills, PCD Taps, Cabide Inserts,Carbide Drills, Carbide Reams, Taps etc.,
We also offered customized cutting tools per drawings, and provide package according to customer requirements. We manufacture a series range of cutting tools for machining of Cast iron, Aluminium alloy and Non-Ferros metal, it is widely used in all major sectors like Automobiles, Engineering, Aerospace, Aviation and 3C industry. Premium quality of raw material is used in the production and strict examination during processing with advanced equipment, so our client are satisfied with our reliable quality and on-time delivery.
Our best selling of cutting tools include PCD Inserts, PCD End Mill, PCD Ball Nose Mill, PCD Reamer, Carbide Taps, Carbide End Mill, Special Form Cutter and many more. For these years we have been made a large forward in the technologies of manufacturing cutting tools. With high quality on performance and price, our product sells well both on domestic and overseas market. And we will always focus on the quality and best service, to make long business relationship.
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We have dedicated team of quality control and precise equipment to keep good and stable performance for our products and processing services.
Premium HSS-PM Drills,High Speed Steel Bit,HSS Drill Bits,High Speed Drill Bits,Carbide HSS PM Drill OPT Cutting Tools Co., Ltd. , https://www.optdiamondtoolss.com
Figure 1 CIE S 009/E: 2012 Appendix A.3 
1.Designed to Machine tool steel,alloy steel,mold steel,and other high hardened materials;
2.Suitable for aluminum,aluminum alloy,copper&non-ferrous materials;
3.Designed for HRC45-55 and HRC60;
4.Altin coating for high wear resistance;
5.High quality with reasonable price;
6.Rapid delivery;
7.Altin/sin/dlc coating and customized coating;
