Last night after a little bit of swinging and palming while relaxing my neck and head muscles, I saw 10/70 on my chart indoors.
This morning I went outside in full sunlight and practiced with my chart. As normal, I could only see the 20/200 line clearly at first. After sunning, swinging, and palming I could see flashes of the 20/70 line with a few brief flashes of the 20/60 and 20/50 lines. It is interesting how much difference the amount of light makes; I saw at least twice as good outside as I did inside.
One thing I will note, however, is that when I practice with my chart outside, I am only outside for less than 10 minutes. I know that longer sessions would probably allow me to clear my vision further, so I will hopefully be able to practice outside for at least 30 minutes within the next few days.