That's very strange... Generally, if you have to struggle to read in your eink ereader, then you would have to do the same with your pbooks (except compared to those with bleached white paper in hardbacks or certain magazines).
Anyway, you should only read with a good light source. I'm not saying a flood light, but you should be near the light source. No dim rooms or whatever. That's common sense since paper writting exists.
