The Bates method (Do You Want Better Eyesight Without Glasses?)
Born in 1860, Dr Bates was a New York ophthalmologist who devised an alternative way of helping people to improve their eyesight naturally using various relaxation and stimulation techniques. The full article about bates can be found in the self-help section of the site:- https://birdshot.org.uk/blog/index.php/self-help/seeing-better-with-bates
This is not a cure for birdshot but it might help improve your vision.