I moved this to private category to not get public readers out of the way.
I feel neck discomfort from wearing glasses. Contact lenses are hard to take off when not needed. So, I tried to go without correction when I don’t need it. Basically, that is now 99% of time.
Several studies proposed that axial length still decreases with more (2-3 D) amount of spherical myopic defocus. Then, what is wrong with formula “axial length reduction in mm from one-hour 3 D myopic defocus * 365 days”? The result is 0.01 mm * 365 days = 3.65 mm per year! So basically even more axial length reduction than I need to reduce to see 20/20!
That is from 3 D spherical myopic (positive) defocus. But, I will have then about 9 D of positive spherical defocus (8 sph 2 cyl) at infinity distances (5 m and more).
Jake warns about blur adaptation. Well, I have glasses I see relatively well in them (20/25 indoor sunny, 20/80 night - my eyes have big spherical aberration that cuts off night vision considerably, but it isn’t present with higher spheres, e.g. -9 glasses not enough, then -9.5 or -10 should work around 100% of problem). I use them when I need to see something clearly at distance. Full correction should give vision up to 20/10 and more despite in-eye aberrations and astigmatism, but I am (or should be) not that wealthy for now.
I can use contacts (even spherical) for close up - in spite of 1.5-2.5 astigmatism I can read medium-size text on computer fairly easy without cylinder especially with less astigmatic left eye from 40-45, 50, 60-70 cm depending on sphere value. Yes, tablet wouldn’t do the job then. But I am too lazy to take on -2 glasses for distance - I am satisfied with leftover -1 cyl -2 vision -7 contacts give me.
Spherical equivalent gives worse visual acuity than slightly less sphere (in the latter case, double vision appears). Yes, I know that each astigmatism is different, and I dare to say, unique to some extent.
Life without correction is fine for me! All is good until I know I can see very, very much clearer (just saying, let I will not look weird), need to be alone (and, want to go back to 20/20?)
Really I need correction that much?