If you started having issues with iOS 14.8 or higher, please consider reaching out to Apple at accessibility@apple.com or calling them here:
United States: 1-877-204-3930
United Kingdom.: 0800 048 0754
Australia: (61) 1-300-365-083
The one silver lining of 14.8 introducing these issues for us is that we can now offer Apple a very specific place to look in terms of what changed with the displays. If you do contact them, make sure to mention 14.8 is where the issues started. Also, If you have any relevant medical diagnoses (BVD, etc), I'd also recommend mentioning that as well.
I contacted them a while ago and mentioned my BVD + issues with A11 to A12 and 14.7 to 14.8, and they replied with this:
"Thank you for your email. We appreciate you taking the time to share, and would like to learn more.
Do you experience similar issues while using any other technology with a screen?
Have you found any solutions, like glasses, eye patch, etc., to mitigate your discomfort?
Do you experience the discomfort that you described during the day, night, or both? "
I've contacted them several times before, and I've never had them actually reply and ask for more info. I'm hopeful that this means they're taking some kind of interest in our situation. I think it would be very helpful if all of us who have issues with 14.8 (or higher) reach out and let them know to look at whatever changed between 14.7 to 14.8. Since we know this is a software issue, the fix could potentially be as simple as an accessibility setting for color profiles.