KM Yes, it is similar to when I look at a bad device. Short exposure causes damage, and the damage does not fade quickly upon removing the trigger.
I do indeed feel enormous tension in my face muscles. I never experienced this before, it had always been more of a neck and back of the head tension, accompanied by eyestrain. In the past though I was always able to dodge bad devices and I was never subjected to such discomforting lighting conditions for long. My twitching did not start immediately. It took about 8-9 months. Initially I only suffered from eyestrain and poor performance at the computer and also reading on paper. You may also remember the story with my Samsung Galaxy on5. I now have doubts that the phone became "bad". It may be that I have subjected myself to unbearable conditions for too long (lighting and two Macs), and at a certain point my body started sending out warnings like twitching and photosensitivity.
Sunspark Eyelid twitching is a psychological stress reaction.
I tend to exclude pure psychological effects, if what you mean is that for instance I am stressed out at work and / or do not like my work environment etc. etc. It is not really the case. I am surviving right because I do not have much pressure. But I am unhappy and worried about my state, so that could psychologically influence.
I am more inclined to think that I have been killing myself for nearly 2 years under horrible conditions, and my body is worn out. I think eye and face muscles are similar to other muscles. If you over-stimulate them and if they are not fit (I do not exclude I have some underlying eye condition like heterophoria), they will let you know sooner or later.
@KM Have you explored the psychosomatic avenue?
Partial good news of the last < 24 hours. There has been a rotation of people and a row of LED spotlights which we used to keep off has now been turned on by the newcomer. I freaked out but interestingly working at the desk feels a bit more pleasant. I hope I can confirm. And if it is the case I will try to run some tests and dig out light specs.