Double Vision

I have been experiencing double vision for about 3 years. I've had every test done by my opthamologist, etc. and there is no known reason why I would be experiencing this. He said it may be because when my eye muscles get tired, they do not contract as quickly.
When I am tired, it is so bad I cannot see the street signs when I drive.
I am wondering if there is a connection to my state of adrenal fatigue due to the weak pupil reflex. When I am tired, does it get worse and therefore my eye muscles are slow to respond?
Anyone else experience this? I wouldn't call it blurred vision necessarily. When I look at a street sign for example is when I notice it the most. I can read it at first but then the word slowly splits into two horizontally. The more tired I am, the quicker it happens until finally I am so tired it is double right when I look at it.
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