What Glasses Are Made Of?
In general, most glasses are made of plastic lenses. Why are glasses lenses made of plastic? In fact, plastic glasses are lighter than traditional glasses lenses used in eyeglasses, which means they are more comfortable to wear. At the same time, it is easy to apply lens coatings like anti-reflective to plastic lenses.
Besides, children’s glasses are also made of plastic because it is more resistant to impact. There are four main types of plastics used to make eyeglasses and sunglasses lenses which are plastic, Trivex, polycarbonate and high-index plastics.
The plastic lenses made from CR-39 were first introduced. CR-39 is an abbreviation for Columbia Resin #39, the 39th plastic of that type made by Columbia Resin.
Then the polycarbonate glasses were invented. Polycarbonate became out of this world once it found use in aeronautics. Polycarbonate is a type of plastic that can be produced as transparent and easily shaped, making it great for glasses lenses. Polycarbonate is impact resistant so that they are a good lens choice for kids. And the polycarbonate lenses have 100% UV protection.
Next, high-index lenses are available. High-index lenses have a high refractive index with a thin lens. Although high-index lenses are thinner, they are heavier due to the higher density of these plastics.
So, what glasses are made of? Most glasses are made of plastics. Then how are glasses made? To get the answer, keep on your reading.
Drivers can wear night-vision goggles
Night-vision goggles can prevent headlights from blinding, add color saturation, and make the field of vision clearer. The normal night vision glasses are golden yellow in color and have a metal coating on the surface. This is the use of diamond high perspective reflection film technology, in the lens to add color and film layer, in order to maximize the brightness of the object being seen. It is to compensate for the light for driving, which makes light pass through your eye. It can increase the three-dimensional sense of objects, making the line of sight more clear, to avoid confusion caused by blinding headlights.
How Do Prism Glasses Work?
After learning what prism glasses are, you should know how prism glasses work. So, in this section, we will show how prism glasses work.
People with binocular are struggling with seeing two images instead of a single image. The light they see falls in different places on their retinas, which causes distortion and doubling of what they are seeing.
Meanwhile, prism glasses are mostly used to deal with double vision, making it easier to maintain binocular vision, which is the ability to maintain focus on an object with both eyes. With the prism glasses, the light bent before it hits the retina. It is redirected so it falls correctly and the brain can interpret the message as getting in the usual manner, resulting in a single clear picture of seeing.
What Do Blue Light Glasses Do?
Blue light has wavelength and energy from 380 nm with the highest energy to 500 nm with the lowest energy. The violent and blue-violent rays are more likely to damage our eyes so these rays are also called harmful blue light.
The blue light can be from the sunlight, fluorescent light, LEDs, computer monitors, smartphones, and tablet screens. Long time exposure to blue light may cause eye strain and discomfort. Hence, wearing blue light glasses is an effective way to prevent your eyes from harmful blue light.
What do blue light glasses do? They are specially designed to filter out harmful blue-violent light rays that are commonly emitted from digital screens.
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.
How do you clean an eyeglass case?
Sprinkle a little water on the glasses case first, to soften the dirt and dust on it. Brush gently with a soft brush to avoid damaging the glasses case. The inside of the case needs to be cleaned with a brush. Use a rag to wipe the surface of the glasses case for moisture and dirt. Wash it several times with a wet cloth. Use paper towels to dry the surface and interior. And then dry in the sun.
Single Vision Lens
Single vision is the most commonly used prescription lens. This lens type has a single field of view or a prescription ability of the entire lens and can be used to correct myopia (nearsightedness) or hyperopia (supervision). Some people need glasses to keep their distance and read. Instead of having a pair of single-vision glasses for each pair of glasses, bifocal or progressive glasses may be a more convenient choice. Unlike single vision, bifocal and progressive lenses are multifocal lenses with multiple focal points, such as distance and near distance. People whose prescription for spectacles list the numbers in the 'ADD' section require bifocals, progressive glasses, or reading glasses because your glasses need to add ADDitional to the distance prescription to see close distances.
