When to take O&M training?

Currently, I'm seeing a retinal specialist to determine what is going on with my vision (there's a lot happening to my retina). I'm 21 years old and I've noticed the past few weeks my vision is getting worse. I'm going to see another specialist in a few weeks because my original one can't... show more Currently, I'm seeing a retinal specialist to determine what is going on with my vision (there's a lot happening to my retina). I'm 21 years old and I've noticed the past few weeks my vision is getting worse. I'm going to see another specialist in a few weeks because my original one can't diagnose me with anything. My question is, if I get diagnosed with something, what's the next step? Do I need to reach a certain level of impairment before I should take O&M training or should I take it right away, knowing I could go blind one day? I'm so unsure of where to go from here. Thank you!
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