Stress can cause vision to get worse then better. When under stress, which includes pain, the muscles around the eye contract pulling the globe of the eye out of shape leading to blurry vision. If this is the case then adaptogenic herbs can help, especially schisandra berry, which is also good for astigmatism. Papaya is also a good choice for both the vitamin C, flavonoids and carotenoids. Juniper berry will help if there is optic nerve damage. Take this one with a little food since it will drop your blood Sugar
There are other things that can help but it all depends on what is causing the disturbance. There are so many things that can go wrong with the eyes.