Hi Jenny,
I can see why seeing the 'funny things' in front of your eyes has made you anxious and fear about a
brain tumor despite assurance from your eye doctor.
I would want to reassure you regarding the same, because a brain tumor is a serious problem that manifests with wide range of symptoms. It presents with prolonged headache, vision blurring, projectile
vomiting, seizures, significant body weakness or
stiffness,
loss of consciousness or
speech difficulties.
There does not seem to be reason to believe that you could have a tumor in your brain. I do not know if the so called 'funny things' are mere artifacts in the eyes that appear magnified when seen across bright light, or if they are just flashes seen with closed eyes after a tiresome reading.
The good news is that, except for the glasses you use, your eye doctor has ruled out a problem in your eyes.
Hence, do not worry about this problem. I think you may try washing your eyes with clear water regularly and taking breaks from reading, during the regular use of glasses daily. If this still does not allay your fear, you may get an investigation of brain-scan (CT) done for your own satisfaction. However, it is not recommended in current scenario.
Hope this answers your question. Happy to help if any more queries.