While light flashes in the eyes are not listed among the common side effects of desmoid tumor treatments in the provided sources, it's important to report any new symptoms to your healthcare team right away. They can determine if what you're experiencing is related to your medication or needs further evaluation.
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Lots of things can cause one to have flashes. Most are benign. Nutritional deficiency, headaches, extreme sunlight for long periods of time if looking at water. Cataracts. The list is long. Just check with you eye doctor. Good luck. I didn't mention some major problems as that is for a doctor to diagnose and probably don't apply to majority of people.
I did have that on Ogsiveo but it all went away when I stopped the medication.
I have had lightening flashes in the side and bottom of my eyes since I started the medication. I have been to MSK opto specialist and they say nothing is wrong - they also say they don’t know it to be a side effect but based upon the onset of the condition they think it can be.