The symptoms you describe could be a sudden fall in blood pressure leading to a postural hypotension
which is common when the person has been standing for a while. The other more serious cause that needs to be looked into is something called Transient Ischaemic Attack where there is a temporary obstruction in the blood supply of the eye and causes the vision loss kind of like a warning sign. You need your blood pressure checked as well as a blood test including cholesterol
levels to be on the safe side. A basic ECG as well would be indicated.
Lastly, any cervical or neck related condition particularly cervical spondylitis
that affects the vertebrae in the neck region causes blurred vision
and neck pain with tingling sensation
in the hands.
Which of these is the cause can only be concluded following further investigations.