What are progressive lenses?
Progressive lenses, also called progressive multifocal lenses, are lenses that have multiple focal points. If it is divided from the focal point, the lenses can be divided into single focal lenses, bifocal lenses, and multifocal lenses. The original intention of progressive multifocal lenses is to provide natural, convenient, and comfortable correction methods for presbyopia patients. A pair of glasses can see far away, close up, and mid-range objects. After wearing them, one pair of glasses is equivalent to using multiple glasses. Because of the different nature, characteristics and applicability, progressive lenses are more expensive than single vision lenses.
Common sense of glasses maintenance
Do not wear glasses when doing strenuous exercise to avoid deformation caused by knocking. Take off your glasses when sleeping or lying on your desk to avoid distorting your glasses. Use special glasses cloth to wipe glasses, and can use water and dishwashing essence to clean. Avoid using paper towels, handkerchiefs, or clothes. Deformations of memory materials are not often demonstrated to prevent breakage of joints or welds. If it is uncomfortable to see things, or the frame appears obvious uneven, you need to take it to the optical shop to find a professional to adjust.
Learn the 9 Necessary Parts of Glasses
Rims: the rims lend form and character to your eyeglasses and they also provide function by holding the lenses in place.
End pieces: they are small parts on the frame that extend outward and connect the lenses to the temple.
Bridge: it is the center of the frame that rests on your nose and joins the two rims together.
Hinges: hinges sit between the end pieces and the temple, allowing you to close your glasses folding the temple inward.
Lenses: lenses are the essential parts of eyeglasses. They are clear pieces of glasses, plastic or other lens materials held in place by the rims. The lenses are crafted and shaped with your unique prescription to help you to see clearly.
Screws: they are the small metal fasteners near the hinges and they are used to connect the end pieces with the temples.
Nose pads: nose pads give your glasses a more comfortable and secure fit. They are the round plastic pieces under the bridge that sit on your nose.
Pad arms: pad arms are able to extend from the rims and hold the nose pads in place. They are adjustable to fit the natural shape of your face.
Temples: temples are the long arms on both sides of the frame that fit over your ears for a snug fit.
These are all the 9 essential parts of eyeglasses. Knowing the name of parts of glasses can help you to repair them once they are broken or crooked.
How Long Does It Take to Get Used to New Glasses?
Most people are excited when they get a new pair of glasses for the first time. But sometimes there is an adjustment period before your vision is fully comfortable. So, how long does it take to get used to new glasses?
In most cases, it takes only a few days to adjust to a new pair of glasses. When you are adjusting to your new glasses, you might experience some symptoms such as mild dizziness, blurry vision, or eye strain. This would be a normal situation. These symptoms are common with new glasses and typically last only a few days.
Even though the new glasses come with the same prescription, different frames or lenses can alter your vision until you get used to the new frame style, frame material or lens type.
Besides, other factors will affect the adjustment time, such as the complexity of your prescription, the type of lens, and so on.
How long does it take to adjust to new glasses? It usually takes a few days. However, if you experience eye strain, distorted vision, and especially headaches for a few weeks, you had better contact the eye doctor or the optician. They will check your eyeglass and the prescription.
How to choose blue light blocking glasses?
While trying it on, look at the electronic screen from a distance to see if it stimulates your eyes. Holding the glasses in front of a display screen or under an LED light to see if they reflect blue light on the surface of the lens. It shows that blue-blocking glasses can block blue light. The special blue light flashlight shines on the white cardboard through the lens, the blue light that passes through the blue-blocking lens is noticeably dimmed, while the blue light that passes through the normal lens is not changed at all, which is what the blocking blue light does. You can go to a professional eyeglass shop to detect instruments through the spectrum of professional authority, and the best blue light blocking rate is between 60%-70%.
What is hard coating on lenses?
Lenses are mainly added in two kinds of film: anti-reflection film and hard film (and some manufacturers produce anti-fogging film and mirror film, but not common). The anti-reflective film is mainly by coating the front surface of the lens with multiple layers of transparent materials with different refractive index and thickness to reduce the excess reflected light on the surface of the lens, by using the principle of light interference. The film can be applied to both glass and resin lenses. The way of hard film plating is usually a soaking process. After many times of soaking and cleaning, soaking in an organic solution containing ultrafine silicon element for a certain time, and then keeping it at a certain temperature for 4-5 hours, the fixed polymerization process of the film has been completed. The surface wear resistance of CR-39 coating can be increased by 2-4 pH, which is similar to the hardness of optical glass lenses.
Choose blue light blocking glasses with guaranteed quality.
Because blue glasses is a kind of special care, which requires quality assurance. Wearing the unqualified glasses for a long time not only failed to protect his eyes against the blue glasses but can also lead to decreased vision. In severe cases, physical disorders can occur, causing dizziness, headache, and so on. So choose a big brand, guaranteed blue light blocking glasses, which can truly protect your eyes.
