I've been losing vision in my right eye since I was 18 or 19, Now I'm 21 and the reason I am writing this is because I want to know what caused me this, I'm especially worried because I read that people that developed multiple sclerosis presented something similar as their first symptom.
I've had a serious bout of headaches when I was younger if it helps.
If you haven't already, see an opthamologist. An "eye doctor", not an optician or optometrist. There is a big difference as to their knowledge of the eyes.
They can examine the optic nerve and the rest of the eye structure. There is also the possibility of a tumor pressing on the optic nerve, if you are truly "losing vision." It may also be a muscle problem.