Re: Glasses anyone?
Correction--you my friend have presbyopia! Which is what happens to everyone as they age, because our crystalline lens loses it's ability to change shape, and adjust our focal depth--hence the reason for progressive lenses that correct for distance, intermediate, and near vision.
I've looked into some headsets with lens inserts, and they're pretty straightforward for folks that rely on a spherical correction (either - for myopia or + for hyperopia) to their vision, because you can get close enough with the OC height, and PD and they'll work.
However, for folks with more complicated prescriptions, it's not that easy, because there are tighter tolerances required. If you have any cylindrical correction (for astigmatism) you have the added variable of Axis to worry about, and minor changes to the OC height, PD, or angle of the lenses will produce a fishbowl effect--which can induce nausea in someone with a high enough prescription. A lens with only 0.25 correction to cylinder can be rotated by as much as 5-10 degrees without the wearer having any issues--but an RX with higher amounts of cylinder (mine I have over -3.00 in mine) can be greatly affected by changes of less than 1<5 degrees! That said, you can flip cylindrical lenses by 180 degrees and be perfectly fine.
Then there's the most complicated prescriptions, that have multi-focal correction (for presbyopia), which still requires lenses remain perfectly in position, because the seg height measurements need to line up correctly, so that the intermediate segment doesn't intrude on the distance vision and the wearer doesn't have tilt their head up drastically to see something at arms length--so a mm difference can be huge!
Basically--I'm all sorts of fucked now (as far as getting fancy lens inserts goes) and I'm only going to be more fucked as I age! So, I'm REALLY hoping that in my lifetime, that they'll be able to figure out how to interface with the optic nerve directly.
In the much nearer future, there may be some hope, because they've come a long way with implanted IOLs (used to repair cataracts) and now they're not only able to correct any refractive errors (including astigmatism) but the latest technology are accommodating IOLs that are able correct presbyopia! They're obviously not quite perfect yet, so you wouldn't want to get them if you didn't already have cataracts--but it seems like we're closer to making the technological advances needed to create a mechanical (or even a bio-mechanical) solution to the problem.