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New users of Google's Glass have taken to Twitter to complain of headaches caused by their $1500 gadgets.

Users have complained of headaches and sharp pains caused by the device, which places a small screen at the top right of the user's field of vision.

Google's medical adviser says the problem is because of the placement of the screen, and warned new users to 'take it easy' as they adjust.

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It is believed the placement of the screen is causing the issues for some new users.

The problems emerged as Twitter users spoke of their pain after wearing the product.

'Personally, it gives me a headache everytime I wear it, wrote twitter user Rohan Chandrashekhar.

'Not to mention, the eye damage all that squinting is likely to cause.'

Another user, Paul Bilodeau, tweeted: 'Got my Glass headache.

'It's going to take some getting used to.'

Writers from Tech blog Betabeat also claim they suffered issues when first using the device.

'After Betabeat tried Google Glass for the first time at Google HQ in New York, both writers experienced a sharp pain after about ten minutes, which went away shortly after we took it off,' they wrote.

Dr. Eli Peli, the Harvard optometrist who consults for Google on the project, said the problem was people getting used to the screen position.

'The only people who look up a lot are some professionals like electricians and painters,' Dr. Peli told Betabeat.

'If you're looking at the Glass for a minute, you're holding it there for sixty times longer than normal.'

The pain goes away for most users after a few days to a week, Dr. Peli said, as the muscles around the eye adapt.

'The recommendation is to not overdo it when you start,' he said.

'Use it in the recommended way right from the beginning.'

Some users have called for clearer warnings to be given for new users.

Google told MailOnline: 'When anyone gets a new pair of Glasses or starts wearing them for the first time there is always an adjustment period until people get used to them.

'For some it's the same with Glass. 

'We encourage Explorers to ease into Glass, just as they would a new pair of glasses.

'As we note in our Help Center, Glass is designed for micro-interactions, not for staring into the screen, watching Friday night movie marathons or reading 'War and Peace.'

Google last week put its controversial eyewear back on sale to the US public.

The firm is offering the 'explorer edition', the $1500 test version of the eyewear, for general sale after an initial 24 hour sale sold out.

It is believed the firm wants to increase the number of people people using the hardware - and potentially clear its inventory for the 'real' consumer version.

The firm announced a 24 hour sale last month after its plans were leaked, and the device sold out within hours.

Today, it reappeared online for sale to anyone if what is described as an 'open beta'.

'Whoops. So... we'd planned to post this next week, but it looks like the cat's out of the bag now,' Google said when its previous plans were leaked..

'Over the past several months, we've been trying out different ways to expand the Explorer program.

'Our Explorers are moms, bakers, surgeons, rockers, and each new Explorer has brought a new perspective that is making Glass better.

'But every day we get requests from those of you who haven't found a way into the program yet, and we want your feedback too.

'So in typical Explorer Program fashion, we're trying something new. '

Stylish: The frames will be available in a range of colors and will work with prescription glasses

Those who currently own the device paid $1,500 to be part of the development process, exchanging ideas on improvements to the design and function in return for the coveted device.

With the release of the second-generation, those already enrolled in the Google Explorer program  were able to 'invite' three of their friends to the scheme.

Reaction to the new design was mixed, with some critics saying changes to the device looked bulky.

Google has come under fire for the unfashionable look of Glass, although has developed its own frames for the system which allow prescription lenses, and partnered with Ray-Ban to develop fashionable frames.

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However, the updates were welcomed by those who have a first-generation device, with comments on its Google + page commenting that the changes would improve user experience.

One owner, Dawn Martin, commented: 'My glass has been useless for phone calls and nav because I can't hear it well enough ... yay for updates/upgrades!'

Improved: The slightly bulkier design comes with a detachable ear piece to improve commands

Upgrade: Big Bang Theory's Kunal Nayyar wearing the Google Glass at the Emmys in September. Those with the earlier design will be able to swap their old device for the new one

Another fan of the device, Jeremiah Townsend, commented: 'Can't wait ... now that we'll be able to use them with prescription glasses, they'll be glued to my face.'

Others however complained that the device was still not widely available.

However, the Google Explorer program has been praised for using a clever marketing model where people buy a product at its developmental stage so they can contribute to shaping its design.

'In essence Google has crowdfunded Glass and has shown big business how crowdfunding can be done. In essence it is a giant kickstarter campaign in all but name,' according to Forbes. 

It estimated that Google would have earned about $50 million during the development phase as well as enhancing the desirability of the product.

Google Glass explorers across 50 states share their views