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Knowing and understanding your prescription is essential when planning on purchasing a new pair of glasses. That is why we 8 bit sunglasses buy back put this little Online Prescription Glasses Guide together.

Keep in mind that if you're not completely comfortable filling your glasses prescription out online, you can just send us your prescription by fax or e-mail and our optical experts will fill it out for you. Every doctor writes their prescription a bit differently, so here are a few examples of what your prescription might look like:.

OD - short for oculus dextrous which really means your right eye OS - short for oculus sinister which really means your left eye SPH - short for sphere - the main part of your prescription. It indicates the strength of your prescription in diopter. CYL - short for cylinder - which indicates the strength of your astigmatism, if you have one. PL - short for plano - which means there is no vision correction needed. Pay close attention to those signs. Mixing up the symbols will affect how you see through the lens.

Now that 8 bit sunglasses buy back understand the abbreviations, let's jump right into your prescription. This sign is quite common and looks like an 8 on its side but it stands for 'infinity'.

Sometimes 'PL' is used instead. To fill your glasses prescription online you can scroll down 8 bit sunglasses buy back select None, Plano 00, or Not all prescriptions have a cylinder and some prescriptions have a cylinder in only one eye. If you don't have astigmatism correction, your doctor may leave the field blank but they might also put SPH, 00, Plano, or DS.

All of these mean you have no correction for astigmatism in one or both eyes. Pay close attention 8 bit sunglasses buy back those signs! Axis should be from degrees and will always be a whole number. If your Axis is written as "6", it can be entered as 06 or Your doctor may write your ADD in the near vision N. Sometimes your doctor will write the ADD once - it will be equal for both eyes and other times each eye will have their own ADD value - like above. If your prescription has an ADD and you only want single vision distance glasses - simply leave the ADD off of your prescription when ordering.

If you're buying reading glasses, 8 bit sunglasses buy back sure to leave the ADD on your prescription - we need it to manufacture your reading glasses. PD - Your pupil distance is important when we are creating lenses to match your prescription because 8 bit sunglasses buy back need the optical center of each lens to align with your pupils! The average PD is 62mm and most people fall within the 54mm to 74mm range.

If you measured your own PD and your number is outside this range - we recommend remeasuring, do not guess your own pupil distance. Your PD is written a few different ways. You may see it written like: If your PD is written as 8 bit sunglasses buy back - simply insert it as Do not add the numbers together. Your PD for near vision will usually be 3mm less than your distance vision PD.

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How come only 0. Hundreds of thousands of pairs of Spectacles sit rotting in warehouses after the company bungled the launch. Initial hype and lines for its roving, limited time only Snapbot vending machines led Snap to overestimate demand but underdeliver on quality and content. What was the problem? Snap generated huge hype for Spectacles, but then waited 5 months to openly sell them. Once people actually tried Spectacles, few kept wearing them, and word of mouth about their disuse spread.

Snap never got visionary video markers onboard. Snap did some things right with Spectacles. The fashion photo spread announcement felt classy and surprising despite clues and photos of CEO Evan Spiegel trickling out ahead. The initial launch was a marketing extravaganza, with multi-hour lines of cool kids waiting on the Venice Beach boardwalk to buy them.

And the Snapbots being dropped in random locations was exciting and made people feel special if they got ahold of them. But once people put them on their face, the excitement died off. Snap first announced Spectacles with some Karl Lagerfeld photos of Spiegel wearing them on September 24th Hype was high despite the beachey color options that turned some people off. It took until November 10th for the first Snapbot vending machines to launch.

While the hype had cooled slightly, demand was huge as people wanted to be the first on the block with Spectacles, and lines stretched down streets. Waiting five months after the initial announcement was an eternity in the fast-moving teenage fad cycle.

Everyone had already seen the sunglasses and circular video all over the Internet, most owners had long since stopped using them, the holiday season had passed, and few people wanted to buy so late.

It took until June, 8 months after their debut, for Spectacles to become available in Europe. If Snap had instead made its announcement, quickly outfitted some lucky normal users and celebrities with Spectacles, then launched a giant Black Friday sale at the peak of its hype, all those people fascinated with the gadget might have bought immediately. Alternatively, Snap could have gone the path of exclusivity lit by its fashion-focused debut. Rather than ever selling Specs openly, it could have gotten them into runway shows and magazines while sticking with the limited-edition Snapbots.

Unfortunately, Snap seems to have got stuck between these exclusive and mass-retail strategies. Where Were The Spectacles Influencers? Yet at the time, it still had a very hands-off approach to dealing with traditional celebrities and web influencers. Instead of top Snappers constantly posting circular videos and encouraging fans to do the same, Snap effectively left the gadget out to dry.

It did little through event marketing or in-app promotion to encourage Spectacle content creation. Cheng was perhaps the only Spectacles influencer lighting the path, with her first-person mirror dancing video and Spectacles-on-babies ad she helped Brawny make.

Even though Snap put more obvious recording signal lights on Spectacles, people would still question you about whether they were on camera. That not only made people uncomfortable being around Spectacles, but made you feel like a bit of a creep just wearing them even if you never tapped the shutter button.

But Spectacles made that difficult. Specs shoot in a proprietary circular video format. On Snapchat, you see the content full screen no matter what orientation you hold your phone in. But when exported, those circular videos get inset within a white square in a locked orientation.

That disqualified a lot of the parties, concerts, meals, and hang-outs people like to Snap. Beyond music festivals, beaches, back yards, and parks, there fewer opportunities to use them then buyers may have expected.

I saw one guy who had popped the lenses out so he could wear them anywhere, but that made their look stick out even more. Snap never struck any official partnerships with companies offering non-shaded or prescription lenses, though some providers of lens replacements cropped up. That led some people with vision problems or who stay out of the sun to write-off the product entirely. Only unofficial third-parties made clear or prescription replacement lens for Spectacles.

Data transfers from the glasses to the phone took forever and would get easily interrupted. They only recorded videos in p, not Videos were clumsily first sent in low-resolution until a higher-res version could be delivered.

Spectacles drain your phone battery super fast. The bulky and oddly shaped triangular prism case was tough to fit in bags and impossible to get in your pocket. The battery and recording lights were confusing. And finally, our hands are already an incredibly agile, auto-stabilized, selfie-able conveyance for a camera. For a v1 product, Spectacles were a valiant effort.

But it was the stuttered roll out, lack of promotional support, and rising competition combined with their hardware problems the doomed Spectacles. Hopefully v2 will correct these missteps. If Snap wants to truly live up to its name as a camera company, it either needs to nail a single gadget you want to use multiple times per week forever, or release an array of short-lived but fun camera toys.

Either way, it must seize on the hype it creates rather than letting it fade, and put the work in to foster an ecosystem of creators to pioneer videography styles everyone else can try.