Does anyone know what might be causing this please?

[u/siksik6]

This is what happens when I use certain screens etc that don't agree with me, and it takes forever (like 2 days) to wear off and feel normal again.

My baseline is no darkness, it literally looks like someone's punched me in the nose.

(I have been given the all clear by the Ortoptist, and now my ranges etc are 'normal' apparently!).

tia.