My left eye is improved! I went today for my half-yearly eye checkup. My peripheral vision is slightly better than it was last time, and the pressure in my eyeball is 18 (12-22 is normal). This is because the eye drops I take each day, are having the desired effect.
More good news - instead of getting two bottles of eye drops on each prescription, I'm getting three, which means that I can get resupplied every three months, the same as all my other prescriptions.