Would lying in bed be an option for you ? If sitting is taking too much energy , you risk degrading your condition further . I am bedbound completely now , but I ' ve had an overbed table for years . It allows you to work , write , use laptop , eat etc . all in bed . If you have to sit in a chair , more important than the chair itself would be raising your legs . <| sep |> That reminds me of my favorite incest jokeHow can you tell if your mother is on her period ? Your brother ' s dick tastes like blood . <| sep |> No , I think you ' re right . What they ' re saying is the dynamic range of the sensors is good enough that you may be able to recover details from poorly exposed photos better than ever before . This doesn ' t mean that the sensors are invariant simply that they have gotten better . There was no revolution in technology that facilitated this , just steady evolution . At some point these people decided that it had passed some sort of threshold which they had defined . In reality , no one is shooting at ISO 100 all the time and just increasing the brightness in post , all the cameras that they say are invariant have an ISO setting for a reason .