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What you are discussing here, to me, shows just how much the use of technology "makes us depend on technology even more". Besides the example you gave with regards to corrective lenses requiring us to get new prescriptions, there exists many other cases that show how the use of technology can be a negative process. The invention of the telephone allowed people to speak from further distances, rather than seeing each other in person. The invention of cars allowed people to move far away from their families and friends, and the invention of airplanes did the same, but in a larger context. Yet, again, without the technology that exists today you wouldn't need your eye-sight for all of the complex processes you have described above. You wouldn't have to drive, because there would be no cars, you wouldn't have to see a chalkboard without the writing utensils that allowed for this. And without your contacts, maybe your vision would have never deteriorated to the point it has. I am not arguing that life would be easier with your vision, if technology didn't exist to the extent it does today. However, how can we know that this wouldn't be the case?