If you have adrenal fatigue, how does it affect your vision?

No such thing. Despite claims on the internet and in some publications, there is no such medical entity called "adrenal fatigue". The hormone foundation has a brief publication based on the endocrine society's statement on "adrenal fatigue".
Adrenal fatigue. Because of its general symptomatology, patient may have trouble concentrating and focusing. Associated symptoms include dizziness and weakness.