Tips to help you choose the right eyeglasses

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The article was professionally consulted by Specialist Doctor II Nguyen Thai Hung - Department of Medical Examination & Internal Medicine - Vinmec Danang International Hospital. Specialist II Nguyen Thai Hung has 13 years of experience as a doctor treating eye diseases.

1. Available lenses

A transparent mass (glass, plastic...) bounded by two curved surfaces or by one curved surface and one plane is called a lens.
As technology advances, the production of lenses is also constantly improved. In the past, lenses were usually made from only glass. Today, most lenses are made of high-tech plastic, which makes them lighter, doesn't break as easily as glass, and can be treated with filters to protect the eyes from UV rays ( UV).
The following lenses are made of materials that are lighter, thinner, and more scratch-resistant than lenses made from glass or older plastics, including:
Polycarbonate . These impact-resistant lenses are a good choice if you often play sports because eyeglasses can easily get damaged. They also have built-in UV protection. Trivex: Organic compounds synthesized from urea-based molecular monomers, they are made from a newer resin similar to polycarbonate lenses. They are light, thin, and impact resistant. Trivex can also correct better vision in some cases.

High Resin Index : If your vision is severely affected, these lenses are lighter and thinner than your previous ultra-thick lenses. Figure Q=sphere: They have various curvatures. That means they can be thinner and flatter so you can use a larger portion of the surface of the glasses. Color-changing with light: Sunlight changes eyeglasses from transparent to colored. If your windshield blocks UV rays, you don't need to wear sunglasses when you're in the car. They can be made from glass or plastic. Polarized sunglasses: These lenses reduce glare so they are useful for people who often play sports and drive. These glasses can make it difficult to see the liquid crystal display on your vehicle's dashboard. The vision problems you have will determine the shape of the lens. You will need a concave (curved inward) lens if you are nearsighted. A convex (curved outward) lens will help if you have presbyopia. If you have astigmatism, your cornea is out of shape, so your lens may look like a cylinder. Simply put, a lens is a tool you use to precisely focus light onto the retina of your eye.

2. Multifocal lens

If you are 40 or older, you will need eyeglasses with multifocal lenses, such as bifocals or multifocal lenses. Previously, you could detect this type of lens by the line between the two parts. But today's products often look seamless.
Bifocals: These are prescription glasses. The lens is divided into two parts with two separate optical effects. The upper part helps with visibility. The lower half is for near vision. They are usually prescribed for people over the age of 40 with impaired vision due to presbyopia. Presbyopia, an age-related change that affects the lens of the eye. Multifocal lenses: help create natural vision like before presbyopia. While bifocals have only two powers, multifocal lenses provide a clear field of view from far to near by relaying steadily increasing power. When working on a computer, when using multifocal lenses, you do not have to bend your head up or down or work in an uncomfortable position. Consult a specialist if you want to choose the right glasses for you. Your doctor will help you choose the best eyeglasses for your needs and vision.

3. Lens Coating

The lens consists of several coatings:
Anti-reflective coating : It can help protect eyes from exposure to glare, reflections, ambient halos and improve vision Anti-scratch coating and UV protection : Most lenses today have both scratch and UV protection built in Tinted lenses : Sometimes, choosing light or dark tinted lenses over a lens can help you see better. Yellow-tone lenses can increase contrast. Gray lenses when using sunglasses will help keep things from changing color. Light tinted lenses can hide the signs of aging around your eyes. Mirror coating: with mirror coating, your eyeglasses will look more stylish, however they can affect your vision. You can choose from mirror coatings in colors like silver, gold, and blue. To be able to use eyeglasses for a long time, you need to pay attention to:
Always store glasses in a dry, clean place, away from things that can affect eyeglasses Clean eyeglasses with water and a cloth no fiber. This will keep your eyeglasses spotless and scratch-free and help you see better. Get regular eye exams. Article reference source: webmd.com

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