Blurred vision!

tony • I live in Liverpool with my wife. Married for 4 years. It`s our 2nd pregnancy but 1st child born. Happiest man alive.
Hi there, has any mums to be, all of a sudden experienced blurred vision in only one eye. My wife called me from work and told me that her left eye is very blurry, to the point where she was unable to drive. It has passed now but I want to know if this is pregncy related or not. She is in her first trimester. Thank you in advance.