Sudden onset monocular diplopia!

[Omne]

About three days ago I suddenly noticed astigmatism/double vision in my right eye, I started to see the light sources stretched to one side or if say, double. I searched the internet and I've found monocular diplopia, with further search I realized monocular diplopia can't happen all of sudden (I'm not sure yet)

I saw an ophthalmologist yesterday, she said I have irregular astigmatism, and it is probably due to keratoconus, she sent me to see a corneal specialist. I insisted that I didn't have this problem before, but she said it is not possible and you probably had it for a long time.

But I'm very sure that I didn't have any of my current symptoms before, but now I see the light bulbs or any bright objects stretched to one side with my right eye and I can't work with my PC as long as before.

Other than keratoconus, what else can cause a sudden onset astigmatism/double vision in one eye only?

[John C Hagan III, MD, FACS, FAAO]

Kconus takes a while to develop but the onset of symptoms can be sudden especially if a condition call corneal hydrops develops.

Many medical conditions take time to develop but come on suddenly like a bridge falling down after many years of use. One car goes over and fine, next car over the bridge falls down. The weak bridge did not develop suddently.
JCH MD

[Omne]

I forgot to say, I'm 25 and male.