Type of eyeglasses cloth
There are many kinds of cloth for glasses. There is mainly sheepskin eyewear cloth, and there is microfiber eyewear cloth. There are suede and double-sided cloth and so on. Professional eyewear cloth must use more than 200 grams of weight/per cubic centimeter of microfiber. This kind of raw material chemical fiber is fine, and tactility is soft, so it will not damage the lens. This kind of wipe cloth can be used on a computer screen. The two sides of the cloth are different, and the smooth side is used to scrub the lenses. Because the dirt on the lens is mostly small. The rough side is designed to give you more friction when you touch it with your finger, so you can use it more easily, and you can clean it more.
Regular eye hospital examination
They must go to the formal professional ophthalmology for optometry and glasses. Wearing glasses after they suffer from myopia, is to correct refraction and clear view. Another important role is to prevent the loss of balance between the adjustment and aggregation functions of the eye. Before getting glasses, they need to go to the hospital for pupil dilation. Many parents are afraid that dilating pupil has a bad impact on their children's study, or afraid that dilating agents will affect the health of their children, so they ask their children to choose computer optometry for glasses. Failure to dilate the pupil and optometry will cause harm to the child's eyes.
Refractive index of spectacle lens
It is generally believed that the higher the refractive index, the better the spectacle lens. Such spectacle lenses are relatively thin, and of course, the price is a bit expensive. When the refractive index increases, the direction of the light entering the lens will change greatly, the focus will move to the lens, the focal length will be smaller, and the diopter will become larger. In order to keep the diopter unchanged, it is necessary to reduce the curvature of the lens, that is, to reduce the curvature of the mirror surface, so that the thickness of the lens can be reduced. This is why the larger the refractive index, the thinner the lens is. Under the same premise of other things, the larger the refractive index, the thinner the lens, the lighter and more beautiful the lens, and the higher the price, but the larger the refractive index is not the better.
How to do with it?
Wash your glasses once a week to avoid future accumulation. Remove the green goo with a soft cloth, a cotton swab, some mild dishwashing liquid, alcohol, and a soft-bristled toothbrush. Ultrasonic cleaning machines can remove dirt and green mud because vibration can do with micro-mud. This device is available in most optician stores, so you can have your glasses cleaned there. Just like anything we use, glasses need to be replaced. It is recommended that you replace the nasal pad with a new one every 6 months to keep it sanitary.
Why do you need blue-light-blocking glasses?
High-energy blue light would penetrate the lens and directly enter the retina, causing the atrophy and even death of retinal pigment epithelial cells. The death of light-sensitive cells will lead to vision loss or even complete loss, which is irreversible. Blue light at 415 nanometers to 455 nanometers is short, that is, high energy and harmful blue light. This band of blue light would penetrate the lens directly to the center of the macula, causing irreversible damage to the macula. Excessive intake of high-energy blue light would cause confusion of our biological clock, so the damage of blue light should be paid enough attention to.
What should be noticed about low bridge glasses?
At the same time, the weight of your frame should be evenly distributed across the bridge of your nose or on the nose pad of the frame. If the bridge sinks into your nose, either your nose pad needs to be adjusted better, or you need to find a frame with a wider bridge. In addition, the temple or handle of the glasses should be long enough to fit close to the ear. You should be able to move your head without slipping or slipping off your glasses. In short, for those with a lower nose, a triple match requires that the nose chassis have a thicker or adjustable nose pad, a narrower nose bridge, a wider nose bridge, and a shorter lens. If you have bought a plastic frame in the past or present, you should be able to find the size of your bridge on your current frame. Traditionally, the middle number corresponds to the measurement of the bridge. It is important to look at the position of the bridge on the frame.
Are blue light glasses good for driving at night?
Are blue light glasses helpful when driving at night? The answer is not necessarily. Anti-reflective coating on glasses is beneficial. But blue light blocking won't have any effect on your driving at night. If your glasses have an anti-reflective coating, then they might be helpful for night driving. Otherwise, they won't have any impact.
