I suddenly lost my sight in one eye when a vein in the central part of that eye suddenly became blocked. At my examination in the local hospital it was subsequently discovered that unknown to me at the time, I also had 'Glucoma' present in both my eyes.
This was in 1997, since when I have been taking various types of eye drops on a regular basis to preserve what still remains of my sight. I was not aware that I had 'Glucoma' until this point in time as the effect of 'Glaucoma' is generally a very slow onset over a lengthy time period.
Diabetes was also suspected, as anyone being diabetic runs an increased risk of their developing 'Glaucoma' but in my case diabetes wasn't confirmed until 3 years later.
You will probably find that you will need to take regular eye-drop medication throughout your life, and should you have difficulty in getting the eyedrops onto targer, there is an excellent device availabe that can help position the eyedrop bottle over the eye before releasing the eyedrop. It can be obtained through the pharmacy and is called the AUTODROP. I used to waste countless eyedrop until I found this item.
Any peripheral visual field damage that has already occured unfortunately cannot be restored and I myself now only have the upper half of my vision still remaining in the one 'Good Eye'. However please stick with and regularly use the prescribe eyedrops and attend every follow up at the eye clinic or hospital as this will ensure you keep what sight you still have.
Glaucome is much like Diabetes, in that both condition are very frightning when first discovered, but if it's any help, don't worry unduly, I was diagnosed in 1997 and my sight is fortunately still holdng out.