I know you say that the humidity is OK, but the reason the snake has gone so many days after the clearing of the opaqueness, is lack of humidity. Enforced soaking is required at this point. Maybe the snake spent a lot of time basking or whatever, but that snake needs humidity. You can do enforced soaking, or make a humidity bin, there's lots of ways to do it, but do something soon. I am a fan of enforced soaking, but if this keeps happening then a humidity bin all the time is the way. Some boas have a chronic dry skin condition, and need more humidity than others. I don't recommend the large number of other things you might hear. Soaking and humidity bins are tried and true.
Even if she doesn't seem stressed out, she now has reduced vision, and she's in a shed, she's gonna feel grumpy even if she doesn't show it to you. Until she gets those spectacles off and she can see normally, don't take her out, except to soak her. You can soak her up to 3 times a day for an hour.
Good luck
-----
Caden Chapman
slithering.serpents@gmail.com
http://slitheringserpents.com