Vitamin B2 (riboflavin), and vitamin B3 (niacin)

From the literature on the Net, we see that VITAMIN B2 (riboflavin) and VITAMIN B3 (niacin) may improve vision in cataract patients, sometimes within a few days.
But please note: There are also warnings that taking more than 10mg of Vitamin B2 per day may make vision worse. This is because Vitamin B2 (the yellow B vitamin) also has a 'photosensitizing effect', generating ROS (free radicals) upon exposure to blue light that would worsen cataract symptoms. What can we do to get the benefits of B2 without the disadvantages? I am just guessing - but maybe, if we invest in a pair of good eyeglasses with blue-blocking lenses, then, we would get less exposure to blue light and hence, we could then take more Vitamin B2 for its cataract reversal properties - up to 50mg per day - and get an improvement in vision. For the moment, I cannot afford blue-blocker eyeglasses and so I cannot test this out. Therefore, I am restricting intake of Vitamin B2 supplements to 10mg/day.
As for Vitamin B3 (niacin), I recommend getting it from food rather than supplements, which can have side-effects. I think we can get enough of it by consuming kale.