These benefits are due to the ability of AR coating to virtually eliminate reflections from the front and back surfaces of your eyeglass lenses. With reflections gone, more light passes through your lenses to optimize visual acuity with fewer distractions (especially at night), and the lenses look nearly invisible — which enhances your appearance by drawing more attention to your eyes and helping you make better "eye contact" with others.

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Organizations take different approaches to creating ghost images, depending on the specific use case. For example, IT teams that support numerous desktops -- whether in the hundreds or the thousands -- need an imaging tool that can deploy images to the computers in batches and can also perform individual restores. In contrast, cloud providers are more likely to use the imaging tools that are part of the cloud software stack.

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In computing, ghost imaging, also called disk imaging, is a data backup process that creates an image of a computer's hard disk drive (HDD), solid-state drive (SSD) or one of the drive's partitions. The image contains an exact copy of all the contents on the disk or partition. The contents can include the operating system (OS), configuration settings, master boot record, applications and their data, and user data -- everything needed to restore the disk or partition to its original state or to replicate it to another system.

In addition, cloud platforms such as OpenStack include image management capabilities, while major cloud service providers maintain their own imaging tools and libraries for use on their platforms. Windows, Linux and macOS also include tools for creating and restoring disk images.

The term ghost imaging has been steadily giving way to disk imaging as the predominant label used to refer to this type of imaging. It is now the term most favored by vendors and others in the industry.

Depending on your lifestyle, your optician might suggest a specific brand of anti-reflective coating. If you spend a lot of time working at a computer, you might benefit from an AR coating that filters out blue light.

Some anti-reflective lenses have surface treatments that are both hydrophobic and "oleophobic" (also called lipophobic), which means they repel both water and oil. These combination treatments typically contain fluorinated materials that give the lenses properties that are very similar to those of nonstick cookware.

Also, don't attempt to clean AR-coated lenses without wetting them first. Using a dry cloth on a dry lens can cause lens scratches. And because anti-reflective coating eliminates light reflections that can mask lens surface defects, fine scratches often are more visible on AR-coated lenses than on uncoated lenses.

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Anti glare and antireflective glasses

Administrators should also keep in mind that a disk image is tied tightly to a specific hardware platform. If an organization manages many different types of target systems, the process of creating, managing and deploying images becomes increasingly complex. The more types there are, the greater the complexity.

When the coating materials are bombarded by electrons, they vaporize within the coating chamber and adhere to the surfaces of the lenses — creating a uniform, microscopically thin optical layer on the lens.

Ghost imaging is often used to back up a computer disk so it can be easily restored to a point in time in case of drive failure or other disaster. Having a loadable image for a specific disk or partition makes disaster recovery (DR) easier and more efficient.

When applied to photochromic lenses, AR coating enhances the clarity and comfort of these premium lenses in all light conditions without reducing their sun-reactive performance.

Anti-reflective coating also is a good idea for sunglasses, because it eliminates glare from sunlight reflecting into your eyes from the back surface of tinted lenses when the sun is behind you. (Generally, AR coating is applied only to the back surface of sunglass lenses because there are no cosmetic or visual benefits to eliminating reflections from the front surface of dark-tinted lenses.)

Antireflective vsAnti GlareLenovo

Anti-reflective coating (also called "AR coating" or "anti-glare coating") improves vision, reduces eye strain and makes your eyeglasses look more attractive.

Typically, a production line includes multiple washing and rinsing baths, including ultrasonic cleaning to remove any traces of surface contaminants. This is followed by air drying and heating of the lenses in special ovens to further remove unwanted moisture and gases from the lens surface.

While the lens racks are rotating in the coating chamber, a power source within the machine focuses a beam of electrons onto a small crucible that contains a series of metal oxides in separate compartments.

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At the time, Ghost was the only readily available product that could easily create an image of an entire hard drive. Ghost could either save the image as a file on another drive or transfer the image to another hard drive, making the new drive an exact copy of the old one.

Although Ghost Solution Suite has a long history, IT teams are also turning to alternative products such as the following:

The use of the word ghost is a carryover from when the technology was first introduced by New Zealand-based entrepreneur Murray Haszard, when he developed the Ghost imaging tool in the mid-1990s. The term ghost was an acronym for "general hardware-oriented system transfer." Symantec Corp. acquired the tool in 1998, integrated it into its Norton product line and later renamed it the Symantec Ghost Solution Suite.

Ghost imaging also provides more flexibility for creating backups, in terms of granularity and image types. In addition, the disk image can be compressed to save space and speed up transfers, and it can be encrypted for security.

Broadcom acquired Symantec in 2019 and continues to offer the Ghost Solution Suite. There are also many other alternatives now available for imaging drives and partitions.

Despite these challenges, ghost imaging is still an effective strategy for streamlining large-scale computer deployments consistently and reliably. Disk images might not be as simple to restore as cloned images when it comes to replacing a single disk, but they provide a reliable approach to system backups and DR, especially with their support for compression and incremental disk images. They also offer greater flexibility than cloning when it comes to creating the initial images.

Anti glare and anti reflectionfor glasses

Applying anti-reflective coating to eyeglass lenses is a highly technical process involving vacuum deposition technology.

However, administrators must exercise caution when using ghost imaging to update their managed computers (as opposed to deploying new systems). Disk images cannot be applied incrementally to a target computer. The new image will replace the entire drive or partition. As a result, all user data and customizations will be lost, so will any patches or software updates that were applied to that computer, unless they were also applied to the disk image.

Difference betweenanti glare and antireflective glasses

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AR coating is especially beneficial when used on high-index lenses, which reflect more light than regular plastic lenses. Generally, the higher the index of refraction of the lens material, the more light that will be reflected from the surface of the lenses.

Anti glarevsAntiReflective TV

For example, regular plastic lenses reflect roughly 8 percent of light hitting the lenses, so only 92 percent of available light enters the eye for vision. High index plastic lenses can reflect up to 50 percent more light than regular plastic lenses (approximately 12 percent of available light), so even less light is available to the eye for vision.

Some eyeglass lenses have factory-applied AR coating on both lens surfaces. Other lenses, particularly progressive lenses and other multifocal lenses (bifocals and trifocals), have the coating applied after the lenses have been customized to your eyeglass prescription by an optical lab.

Anti-reflective coatings are incredibly thin. The entire multilayer AR coating stack generally is only about 0.2 to 0.3 microns thick, or about 0.02 percent (two one-hundredths of 1 percent) of the thickness of a standard eyeglass lens.

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Depending on the AR coating formula, most lenses with anti-reflective coating have a very faint residual color, usually green or blue, that is characteristic of that particular brand of coating.

Anti glarevsantireflective for night driving

A disk image is usually thought to include all the content necessary to restore a drive or partition. However, disk imaging software can often generate multiple types of backups:

Ghost imaging can also be used to deploy multiple computers at the same time, even if they number in the hundreds or even the thousands. To prepare for such a deployment, administrators usually set up a master machine and create a ghost image of its drive. Next, they apply the image to the target computers and then run a customization process that gives each OS its own identity.

A ghost image is typically saved as a single compressed file, which might also be encrypted. In some cases, the image is split into multiple files for easier storage, or it is not compressed. However, it is commonly created as a single compressed file, making it easier to work with the image and support various use cases. Because the image file can be so large, it is often saved to a file server or external storage device.

For example, if a PC fails for some reason, a ghost image can be used to restore the user's environment to that computer or a new computer. The image will contain the OS, configuration settings, applications and user data, making recovery much faster and easier than trying to configure the system from scratch. The same is true at the server level, except that the image also includes network and security settings.

Anti glare and anti reflectioncost

When cleaning AR-coated lenses, use only products that your optician recommends. Lens cleaners with harsh chemicals may damage the anti-reflective coating.

In addition to disaster recovery, ghost imaging can also be used to replace or upgrade a drive. For example, if a user is moving from an HDD to an SSD, the user can create a disk image, upgrade to the new SSD, and then apply the image to the new drive. IT administrators can also use ghost imaging to create a disk image for deploying the same desktop environment to multiple computers. In this way, a single image can be applied to the computers simultaneously, greatly simplifying the deployment process.

Because the contents are not compressed into a single file, restoring a drive from the clone is faster and easier than from a disk image. This approach can be especially beneficial when upgrading a drive or moving to a new system. However, users cannot clone a single partition, only the entire drive. In addition, they can save only one clone to the target drive. With ghost imaging, they can save multiple disk images to the same drive and, of course, you can clone partitions.

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The visual benefits of lenses with anti-reflective coating include sharper vision with less glare when driving at night and greater comfort during prolonged computer use (compared with wearing eyeglass lenses without AR coating).

Ghost imaging, or disk imaging, is sometimes referred to as disk cloning. However, the two differ in important ways. Although they can both create exact copies of a drive, the copies themselves are not the same. Disk cloning duplicates the drive's content and saves it to another drive, without creating an image file or compressing the contents. The new drive is, in effect, a clone of the original drive.

Today's modern anti-reflective coatings can virtually eliminate the reflection of light from eyeglass lenses, allowing 99.5 percent of available light to pass through the lenses and enter the eye for good vision.

Disk images are often generated as part of a larger backup strategy. If a computer fails, a backup image can be used to restore the computer within minutes and with minimal data loss. When the image is applied to a computer, the disk or partition is restored to a specific point in time, based on when the image was created. The greater the amount of time between image creation and computer failure, the greater the chances of data loss.

The first step in the AR coating process is to meticulously clean the lenses and inspect them for visible and microscopic surface defects. Even a tiny smudge, piece of lint or hairline scratch on a lens during the coating process can cause a defective AR coating.

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The lenses are then loaded into special metal racks with spring-loaded openings so the lenses are held securely but with virtually all lens surfaces exposed for the coating application. The racks are then loaded into the coating chamber. The door of the chamber is sealed, and the air is pumped out of the chamber to create a vacuum.

Most premium AR lenses include a surface treatment that seals the anti-reflective layers and makes the lenses easier to clean. "Hydrophobic" surface treatments repel water, preventing the formation of water spots.

Difference betweenAnti glare and antireflective laptop screen

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Organizations that need to configure multiple computers often turn to ghost imaging because it is much faster that setting up each machine individually, especially if there are many machines or the installation includes many applications. Disk imaging can save hours of setup time compared to loading and configuring the OS and applications one computer at a time. This approach also reduces errors in the deployment process.

Since each layer affects different wavelengths of light, the more layers there are, the more reflections that are neutralized. Some high-quality AR coatings have up to seven layers.

Each AR coating manufacturer has its own proprietary formula, but generally all anti-reflective coatings consist of multiple microscopic layers of metallic oxides of alternating high and low index of refraction.

Unlike the early days of ghost imaging, there are now many products available for creating disk images. As already noted, Broadcom offers the Ghost Solution Suite, which is still sometimes referred to as the Symantec Ghost Solution Suite. In addition to being able to capture and deploy disk images, the suite supports scripted OS installations, user and application settings migration, driver to device mappings, and remote task execution and sequencing.

By eliminating reflections, AR coating also makes your eyeglass lenses look nearly invisible so people can see your eyes and facial expressions more clearly.

Differential and incremental images are always used in conjunction with full images. If differential and full images are used together, a complete restore requires the most recent full image and the most recent differential image (unless trying to restore a system to an earlier point in time). If incremental and full images are used together, a complete restore requires the most recent full image and all incremental images since the full image was created. For this reason, the restore process usually takes longer to complete than the other options.