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Based on my experiences, i suspect polarisation may be a component of the eyestrain I experience. Namely, my good tolerance of plasma tvs, and poor tolerance of LCD and OLED screens, both of which use polarisation filters.
I have devised two experiments, I have not yet decided which to try first.
Firstly, I have discovered that the polarisation layer in OLED phones can be removed without damaging the OLED component. The polarisation layer is not necessary for OLED screens to work, but improves contrast. Removing the polarisation layer seems to be a skilled process that may take time and equipment to master, in addition to a few practise phones. It is also not clear just how bad OLED screen contrast is without the polarisation layer - the screen may be unusable in well lit areas.
The second experiment is to buy a quarter-wave film. This polymer sheet when positioned correctly on a screen, like a normal screen protector, will convert linear polarised light into circular polarised light. I do not know if circular polarised light is better than linear. The filters are available here: https://www.edmundoptics.com/f/polymer-retarder-film/14827/ though there may be cheaper alternatives.
I will keep you updated on progress.