http://www.wired.com/beyond_the_beyond/2014/01/augmented-reality-parylene-and-vinyl-electronic-contact-lenses/

Right now the technology is just a demonstration of what will hopefully be coming in the not to distant future. The technology is essentially just a contact lens with a circuit in it. While this doesn’t have anything close to the capabilities of an Oculus Rift, it has the potential to have much more practical and mobile functionality. This in my opinion is an important step forward in technologies seamless connection to our body’s. Although im not sure how long it will take to even have the applications of an Oculus Rift, the contact lens  looks to be the next step to increase the practicality of augmented reality. It may be a stretch to think we can get the technology down to a size that fits into a contact. However, in 1956 the first computer hard drive was exponentially larger than todays.

http://www.wired.com/wiredenterprise/2014/01/tech-time-warp-ibm-ramac/?cid=co16608774#slide-id-121131

So to me it doesn’t seem inconceivable that we could have a complex augmented reality application in a contact lens in the next 3/4 century. The upside of this is that we could have a wearable augmented reality that you would barely even notice on your body. The  drawbacks of these potential technological advancements could be people rarely going outdoors or interacting with real people. However, if used responsibly the potential applications can even go beyond augmented reality. Ideally the technology could be used in partnership with our brains. This also presents potential issues of how our brains would respond to such technological connection.