What symptoms does myopia have?
Myopia is a problem related to the eye's ability to focus on distant objects. The manifestation of myopia is that blurred vision at a long distance. But near-distance vision is good. Early myopia often has long-distance vision fluctuation and squinting when looking at distant objects. Because looking close need not or less use an adjustment, and set function is weakened correspondingly. Those with high myopic have poor far vision, often accompanied by poor night vision, floaters, and other symptoms. Changes in the fundus of the eye can occur to varying degrees. It can form irregular shape white atrophy spots and so on.
What Are Varifocal Glasses?
Varifocal glasses, also known as varifocals, varifocal lens, PLA, or progressive lenses, have a gradual change in strength from the top of the lens to the bottom with multiple focal points in between. Unlike bifocals, varifocal glasses have no specific area of lens strength, but progressive lens zones.
The way to look through varifocal glasses depends on what you want to look at. If you are looking at the distance, you look through the top of the lens. If you want to look at the close objects, you may need to move your eyes lower to keep the objects in focus. For the best close-up focus, you need to look through the bottom of the lens.
The benefits of varifocal glasses are that they do not need to buy or prepare 2 separate pairs of glasses or need to switch between frames for different vision needs.
However, if you wear the varifocal glasses for the first time, you may come across some problems.
How to buy contact lenses online?
Choose the right contact lens for your situation. Base arc and degree need to be added in the hospital or optician shop to determine. Try not to buy according to the framed degree. Some businesses claim to have the lenses having South Korea's silicone hydrogel, with annual throwing. They are not to be believed, because the material characteristics of the silicon hydrogel are not capable of making long-time discarded type lenses. There are a lot of things to pay attention to in order to properly wear contact lenses. For example, a medical optometry sheet is the premise of attention. Each pair of contact lenses is marked on the package of the basic arc, diameter, water content, diopter, and other parameters. Only according to the optometry sheet, you can choose the correct basic arc, diameter, and diopter. At the same time, there is a certain distance between the glasses and the cornea.
How To Choose Better Night Driving Glasses?
Driving at night has a high accident rate because of poor visibility, blinding headlights, and fatigue. Now the market exists a few main glasses: sunglasses polarizing lenses, Glasses that use or mimic the first generation of patented technology. So how do you compare the options between driving and wearing glasses?
Night driving lens is relatively special compared with daily driving lens, not only to prevent strong light and see the road more clearly. According to the national motor vehicle driver special glasses standards, QBT 2659-2004 daily light transmittance should be more than 8%, night light transmittance should be more than 75%. Be sure to consult customer service. Ask about the situation. Note that a pair of polarized sunglasses are not suitable for use at night, and the light transmittance must reach the national safety standards.
How to Know If You Need Bifocal Glasses?
As you get older, you will find that is more and more difficult to read or focus on things that are really close up. This is called presbyopia and it is a common eye condition among older people.
How to know if you need bifocal glasses? If you find yourself squinting at the text that once was easy to read or your vision is blurry, you may need to see an eye doctor. In this situation, you may need bifocal glasses to correct your eyes.
If you currently wear glasses but see print more clearly when you remove them, it is a sign that you may need bifocal glasses in the future.
To know if you need bifocal glasses exactly, check your eyes by an optometrist or ophthalmologist.
How to Remove Coating from Glass Lenses?
To remove anti-glare coating from glass lenses, you need to prepare the following things: isopropyl alcohol, plastic scraper of some kind, salt water, water, plate or bowl.
Now, we will show you how to remove coating from glasses.
- Mix 5 parts of isopropyl alcohol with one part of saltwater.
- Place your glasses onto a plate and pour out the prepared solution just enough so the lenses are entirely submerged.
- Let it sit in the solution for an hour to soften the anti-reflective coating.
- Scrape off the anti-reflective coating using a plastic scraper.
After that, you have removed coating from glass lenses.
Athletes wear non-prescription sunglasses.
Some people opt for non-prescription lenses for fashion reasons. Shatter-proof non-prescription glasses are popular among athletes. Cyclists wear glasses to protect their eyes from debris and to protect their eyes from the wind. Squash players may wear glasses to reduce glare on the squash court and to provide protection against ball collision or breaking up an opponent's racquet. Gun lovers can wear glasses to reduce glare in outdoor environments. Most non-prescription glasses do more than one thing, and safety is almost always a primary concern. These non-prescription sunglasses filter out harmful UV rays.
