It is tempting to take a stance against modification of humans, but we must understand as best we can what we are talking about first.
It might be worthwhile to consider that this essential you, the thing that makes your eyes see particular colours and be a particular colour that gives you your dimples, your height and your propensity for cancers is a mere one tenth of your cellular mass.
Amazing really and somewhat disconcerting but there are ten trillion cells in your body made of your own DNA, another 90 trillion are foreign microbes, parasitically helping you to digest your food and nourishment to provide energy for your body.
It is also worth recalling that this imagined perfect thing, this ‘us’, that we are understandably hesitant to tinker with has already shown itself to be very resilient and malleable. We have parts of other animals in us, pigs and bovine heart parts for examples.
We might also point out that glasses are enhancements in an unnatural way, as indeed are vaccines, antibiotics and any other medicines you might want to mention.
The deep seated fears of Frankenstein and some of their manifestations in Nazi experiments, say, are necessary to keep us aware and cautious, but we must be equally cautious that we do not confuse the danger of people harming us with technological advance, what is at issue more often than not is how people treat us….we could have decided that cochlear implants were unnatural and although the devices will get smaller and smarter and more connected (and there will be new considerations and required cautionary steps) we should keep in mind the potential for good: