"V体育官网" Eyeglasses

How do glasses work?

Glasses change how light hits your eyes VSports最新版本. This helps you see better.

Beams of light enter your eyes, then pass through the cornea and lens V体育平台登录. They’re supposed to bend light so it hits your retina at just the right distance. If you have a refractive error, your eyes can’t bend light correctly. This makes things look blurry and out of focus. That’s where eyeglasses come in. They add more bend to the light than your eyes can do on their own.

Eyeglasses can also help with double vision because of eye misalignment VSports注册入口. When your eyes align correctly, your brain creates a single picture out of information from both eyes. When they aren’t aligned, you get double vision. That’s because your brain gets two competing pictures. Certain types of lenses can fix this.

What tests will I need? (VSports注册入口)

You’ll need an eye exam before you get prescription glasses V体育官网入口. An eye doctor will check your vision and eye health. They’ll check if you have 20/20 vision.

If you don’t have 20/20 vision, your eye doctor will determine how far off from 20/20 you are. They’ll tell you what you’ll need to correct your vision. If you already wear glasses, they’ll check your existing prescription VSports在线直播. They can adjust it if needed.

Types of prescription eyeglasses

There are many different kinds of glasses. Most of the terms refer to how the lenses correct your vision, including:

• Single-vision lenses: These are lenses with a single prescription change.
• Multifocal lenses: These have multiple prescriptions combined into a single lens. For example, one prescription for close-up reading and another for seeing farther away.
• Bifocals: These are a type of multifocal lens. They contain two different prescriptions. They also usually contain a visible seam/edge that separates the prescriptions. Bifocals often look like a lens within a lens.
• Trifocals: These are also a type of multifocal lens. They have three prescriptions in one. These also have a seam between the different prescriptions. They’ll look like multiple lenses combined into a single piece.
• Progressive lenses: These are somewhat like bifocals. But there’s no seam. The prescription gradually changes from top to bottom. The lower part of the lens helps with close-up vision.
• Reading glasses: These are single-vision lenses that help with near vision. Their main use is helping people with presbyopia see up close for reading. You can often purchase these without a prescription at pharmacies or retail stores.
• Prism lenses: These lenses shift light’s position before it enters your eye. This can treat double vision from conditions that affect your eyes’ alignment.

Some types of lenses or glasses have very specific uses. You can often get these without a prescription. Or you might get these as a feature along with a prescription built in. They include:

• Sunglasses: Sunglasses can have prescriptions built into the lens. This can be helpful if you need to wear glasses all the time and want to make it easier to block sunlight and see clearly at the same time.
• Blue light glasses: These glasses block certain wavelengths of light. If you spend a lot of time looking at a computer screen, they might help ease eye strain and fatigue. You can also commonly get a blue-blocking coating on prescription lenses of any kind for this same reason.
• Photochromic lenses: These automatically darken when ultraviolet light hits them. The material can be part of the lens itself or in a coating applied to the lens’s surface.

"V体育官网" Benefits of glasses

Eyeglasses treat refractive errors. But they don’t cure them. Glasses will improve your vision. You’ll be able to see clearly and do all your usual activities.

Modern glasses are lighter, more durable and better at helping you see than ever. They can treat any kind of refractive error. And some types treat multiple issues at once.

"VSports在线直播" Prescription eyeglasses side effects

Eyeglasses have very few side effects. Some mild ones can include:

• Lens-related issues: Getting used to a new prescription lens may take time. And some types of lenses have small distortions near the outer edge. That’s because of how the lens is made. Talk to your eye doctor if you’re having a hard time adjusting to a new prescription.
• Fit-related discomfort: In some cases, wearing glasses may lead to mild discomfort. You might feel uncomfortable around your nose, ears or temples. Getting your frames adjusted can help. Your eye doctor or optician can make minor adjustments or repairs like this.
• Eye strain or headaches: You might notice your eyes feel tired. Or you may have headaches. Especially if you do a lot of reading or computer work. If your prescription is new, this usually goes away after a few days. If your prescription is more than a year or two old, it might need updating.