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This is Dr. David
verticle white streeks can be a sign of macular degeneration
but your doctors have checked your eyes and checked your retina 2 months ago
and found no evidence of macular degeneration.
most eye floaters are benign.
mucus or hair or changes of your focal point can cause you to see small or larger floaters in your visual field.
after climbing stairs, you can have drops in your blood pressure or drops in blood glucose levels which can cause changes in vision or floaters
have you had your blood pressures and glucose levels checked after exertion?
you may need some heart and lung testing to make sure they are working ok.
these floats and streeks can still be benign and may not point to serious problem.