Principle of eye protection lamp: The frequency conversion electronic ballast is used to increase the electrical frequency from 50Hz to 30-50kHz, and the change of light is very small due to the afte ...
Retinal detachment is mainly due to the degeneration or thinning of the retina, the appearance of holes, and the liquefaction of the vitreous in the eye, and the water infiltrates under the retina, ca ...
The main damage of computer and mobile phone screens comes from the long-term light damage of the blue light and ultraviolet rays of the screen to the eyes, especially the fundus. Therefore, it is rec ...
How to relieve: 1. It can be relieved by adequate rest or cycloplegia drugs 2. Develop a good eye habit 3. Whether to wear glasses must follow the doctor's advice. Because premature glasses may dam ...
Myopia is a disease. According to the degree of myopia, myopia can be divided into three categories Moderate and low-grade myopia only needs to wear glasses, but when high-grade myopia is too long, ...
The current mainstream view is that glasses need to be worn all the time to get better visual quality. Only when the degree of myopia is very small (less than 200 degrees), the near-sightedness will n ...
As myopia worsens, the anteroposterior diameter of the eyeball will also become longer. Generally speaking, if the average power increases by 300 degrees, the corresponding eye axis length will increa ...
The truth: myopia glasses can generally be prescribed with the smallest degree of the best vision. Assuming that you can see 1.0 when wearing 300 degrees, you can see 1.0 when wearing 275 degrees, and ...
Truth: No! Whether the myopia is deepened has nothing to do with glasses, but is caused by changes in the refractive state of the eyes themselves. Wearing glasses is to correct myopia, and wearing the ...
Pliers Angle adjusting pliers There is a depression in the two jaws of the angle adjusting pliers, which can hold the hinge of the frame. The depression in the jaws clamps the end of th ...
(1) Width of the frame: refers to the distance between the inside of the two temples, and the measurement position should be 25mm from the back of the lens ring on the inside of the two temples. (2 ...
1. Yellow lens, filtering 100% UV clear eyesight Yellow lens sunglasses can filter 100% of UV light, allowing infrared and 83% of visible light to penetrate the lens. Its biggest feature is that it c ...
If you choose the wrong sunglasses, in addition to the eyes will suffer, even the body may be out of balance. If your body has the following symptoms, it means you should change your sunglasses immedi ...
Buying reading glasses correctly is very important for those who need to wear reading glasses. When you wear reading glasses, you must follow the principle of clarity and comfort. You must not simply ...
1. You can wear glasses without dazzling, don't delay. 2. Full inspection and optometry should be performed before the eyeglasses. 3. Try wearing it for a while after the mirror is fitted. 4. Wear ...
Generally speaking, spectacle lenses can be divided into two categories, namely glass lenses and optical resin lenses. Glass lenses include optical glass lenses and high-refractive-index lenses (comm ...
Reading glasses, also called presbyopic glasses, are a class of optical products. The glasses used by people with presbyopia eyes belong to a convex lens. Reading glasses are mainly to meet the needs ...
1. When wearing glasses, please hold the temples with both hands, take off the front side, and wear the glasses with one hand, which will easily cause deformation and loosening. 2. Wrap the lens with ...
Glaucoma When wearing sunglasses, the amount of visible light entering the eyes decreases and the pupils open naturally. This change in the pupil has no effect on healthy people, but for glaucoma pat ...
Today's UV-resistant glasses are usually divided into two types: sunglasses and polarizers. Sunglasses are commonly known by people and are used to block sunlight and ultraviolet colored glasses. Howe ...
With the advent of summer, the number of consumers who choose sunglasses and myopia is increasing. In order to allow people to buy a pair of qualified and comfortable glasses, experts remind consumers ...
No matter where you store your sunglasses, remember to keep the mirror facing up. 1: Folded. In the design of the frame, the left temple is usually folded first and then the right. 2: Pick and wear. ...
Improper wearing of sunglasses is prone to eye diseases, and it is not necessary to wear sunglasses in dark conditions such as cloudy and indoor conditions. Some people, regardless of the occasion, re ...
Dazzling sunglasses let you stay active in the sun and be free. In fact, sunglasses can block the sun, but can't block pollution damage, so take care to avoid losing face. The method of maintaining s ...
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