Micro USB is the common standard for most mobile devices. The small micro USB connector on one end plugs into your smartphone or other mobile device, while the USB-A connector on the other end plugs into a computer or wall charger.

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USB 2.0, or High-Speed USB, was released in the year 2000. This version saw a significant boost in maximum data transfer rates to 480Mbps.

USB 1.1, or Full Speed USB, is an iteration of the first USB standard – 1.0. It offers a maximum data transfer rate of 12Mbps, and also supports low-bandwidth devices with a slower transmission rate of 1.5Mbps.

Lens power is measured in diopters, so you may see the sphere field above written as −9.00 D—this means there are 9 diopters of nearsightedness. Think of the measuring system as an integer number line, with zero in the middle needing no correction. The further away you get from the zero on either the minus or plus side, the stronger your prescription is.

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The sphere column is often abbreviated as SPH. This is the lens power needed to fix your vision. A minus sign (−) next to the number means nearsightedness (you see better up close and need distance correction). A plus sign (₊) indicates you are farsighted (you see better far away and need your near vision corrected).

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The cylinder number is how much astigmatism you have, if any. This is when part of the cornea has a different curve. Normally, an eye is shaped like a basketball—rotated any direction, the curve stays the same. An eye with astigmatism is oval- or egg-shaped, or more like a North American football—one curve is longer than the other. The CYL number corrects this different second curve.

Because contacts sit directly on the eye, the prescription is different than one for eyeglasses. A contact lens prescription includes measurements specific to the size and brand of your contacts. Before filling a prescription, you also need what’s called a “contact lens fitting” to see if they’re right for you.

Whycylindrical lensis used in astigmatism

Mini USB connectors are found in some portable electronic devices like cameras and video game controllers. However, micro USB has commonly replaced many mini USB connectors.

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You probably have a bunch of USB cables lying around the home. One to recharge your phone, another to power up your laptop, and yet another to connect your digital camera to your computer. USB cables are essential in our everyday life, and until tech goes completely wireless, they’re here to stay. With so many different USB cables on the market, it can be hard to know which type is right for your device. USB 3.0 cable? USB extension cable? Mini USB cable? Read on to find out more about USB cable types and the differences between them.

Cylindrical glassesfor astigmatism

If you've ever had eyeglasses you’re familiar with the odd series of letters and numbers that make up your prescription. We know these as the instructions for making your glasses, but what do they actually mean? Here’s a quick summary:

If you've ever had eyeglasses you’re familiar with the odd series of letters and numbers that make up your prescription. We know these as the instructions for making your glasses, but what do they actually mean? Here’s a quick summary: Which numbers are my right eye and which are my left eye on my prescription? In a typical prescription, two acronyms—one for each eye—are listed:  O.D. This is short for oculus dexter, and is your right eye O.S. This is short for oculus sinister, and is your left eye What does “sphere (SPH)” mean on my prescription? The sphere column is often abbreviated as SPH. This is the lens power needed to fix your vision. A minus sign (−) next to the number means nearsightedness (you see better up close and need distance correction). A plus sign (₊) indicates you are farsighted (you see better far away and need your near vision corrected). Lens power is measured in diopters, so you may see the sphere field above written as −9.00 D—this means there are 9 diopters of nearsightedness. Think of the measuring system as an integer number line, with zero in the middle needing no correction. The further away you get from the zero on either the minus or plus side, the stronger your prescription is. Trial lenses used for checking a person's glasses prescription What is the “cylinder (CYL)” number on my prescription? The cylinder number is how much astigmatism you have, if any. This is when part of the cornea has a different curve. Normally, an eye is shaped like a basketball—rotated any direction, the curve stays the same. An eye with astigmatism is oval- or egg-shaped, or more like a North American football—one curve is longer than the other. The CYL number corrects this different second curve.  Axis This number tells you where the astigmatism is on the cornea. The axis—written in degrees between 1 and 180—indicates which way the astigmatism lines up.  Add There is where any additional lens powers are written. For example, some people over age 40 don’t want an extra pair of glasses for reading. They choose to wear bifocals instead. The lower half of the lens gives them their reading vision. Where is the lens power for prism on my prescription? There may be a field for prism on the right side (not pictured). This is a special type of correction built into the lens for some people with double vision (seeing two separate images of the same object). The prism fuses the two images together so only one image is seen. What about contact lenses? Because contacts sit directly on the eye, the prescription is different than one for eyeglasses. A contact lens prescription includes measurements specific to the size and brand of your contacts. Before filling a prescription, you also need what’s called a “contact lens fitting” to see if they’re right for you.

There is where any additional lens powers are written. For example, some people over age 40 don’t want an extra pair of glasses for reading. They choose to wear bifocals instead. The lower half of the lens gives them their reading vision.

USB 3.2, or SuperSpeed USB+, can transfer data at a whopping 20Gbps. This standard is adopted in newer devices and USB cords like USB-C.

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USB 3.0, or SuperSpeed USB, was released eight years after USB 2.0. But, the wait was worth it. USB 3.0 cables took data transfer rates to 5Gbps (5,120Mbps) – over 10 times the speed of USB 2.0.

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USB cables are staples for connecting and powering electronic devices. Most smartphones use a USB cord for recharging, whereas devices like external hard drives and wired printers connect to computers via USB. USB extenders let you remotely control and access USB devices that are far away, while USB extension cables can extend the reach of already existing cables. If your device needs a USB cable for recharging or data transmission, it’ll likely come with that cable. But when you need a spare or a replacement USB cable, turn to Best Buy’s large selection.

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There may be a field for prism on the right side (not pictured). This is a special type of correction built into the lens for some people with double vision (seeing two separate images of the same object). The prism fuses the two images together so only one image is seen.

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Cylindrical lensused for Which eye defect

USB Type-B cables are less commonly used. They have a squarish-shaped USB Type-B connector on one end, which is generally used for connecting things like printers and external hard drives to computers.

USB, or Universal Serial Bus, is a standard used in numerous cables, ports, and connectors. Here are some common types of USB cables and connectors.

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USB-C is an emerging USB standard that allows you to quickly power up devices and transfer data between them. USB-C cables are reversible with symmetrical oval-shaped connectors, making them a cinch to plug in.

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USB 3.1, or SuperSpeed USB+, saw data transfer rates soar to 10Gbps in 2013. It’s backward compatible with USB 3.0 and USB 2.0, so you can use most USB 3.1 cables with older-generation ports.

This number tells you where the astigmatism is on the cornea. The axis—written in degrees between 1 and 180—indicates which way the astigmatism lines up.

USB Type-A is the most common form of USB. You’ll see this rectangular-shaped USB connector on most USB cables. You’ll also find USB Type-A ports on things such as laptops, desktops, and TVs.