1. Cause of my myopia found
It is evident now that esophoria is the cause of my myopia.
I lose 1/8 to 1/2 of diopter through night.
To reduce this prior to treatment, I use only one eye for close up now.
I closed my left eye all time while in front of laptop. My next wonder was why my left eye sees so bad now after days of closing it for close up yet having normal distance vision time for both eyes. Left corrective lens was “normal” and then it became “too weak”.
I figured out my left eye goes worse after night time. The reason behind it is eye turns in while closed and muscle turning the eye in develops more spasm with consequential accommodative loop and “close up strain”.
Then I started to close right eye. A big discovery was left eye went better while right eye went worse. Left corrective lens is now “too strong”. The same case is with right eye…
Yesterday I left both eyes open working at laptop. Despite considerable amount of distance vision yesterday and improvement of vision, my vision overnight worsened so much that left corrective lens was rather “very weak”.
Let’s imagine what is going to happen for years of this damned route - in past, my distance to the laptop was 30-40 cm and I stared at it like for 3-8 hours without a single break or just switching close up activity, because my eyes won’t realign into distance and I simply neglected my distance vision with both eyes - basically, I’ve had “alternating esotropia”.
2. Accommodative range (exactified)
With -7 CLs, I have
R 10.5 cm (-9.5)
L 10 cm (-10)
As a nearest point of clear vertical lines.
Let’s put it into full correction “sphere without cylinder” power: -8 for right and -8.5 for left.
R -8 - (-7 + (-9.5)) = 8.5 D
L -8.5 - (-7 + (-10)) = 8.5 D
And that is minimum accommodative range for 22.5 years. Definitely not the case if I am not like “early presbyopic”. By the way, some studies show myopes of middle age have more accommodative range than emmetropes and hyperopes - in my opinion, the reason could be overcorrection and lens thinning.
Then, it appears something has “eaten” additional 1-3 D of accommodation. I guess this would be to the less myopic side since I already try very hard to accommodate even more. And that suggests for accommodative spasm (it’s not liftable by cycloplegia) and less axial myopia (expected to be -6~-8 instead of -9).
3. Retina vs eye muscles
A disheartening finding is found when I try to accommodate my very best - I encounter darkening (just like “blacking out”) of my middle (not central and not peripheral) field of vision. It resolves after a few seconds extreme accommodation is halted. It will be interesting to know whether anyone on this forum has it that way or this is some sort of pathology/overthinning that can lead even to retinal detachment.