Actually, blocking out sunlight is quite simple: you can wear a dark, semi-transparent eye mask, or wrap your head in a thin piece of black cloth.
Though your vision might be a bit blurry, as long as it doesn't hinder walking, sitting, or lying down, that's all that matters.
If you want more comfort, you can just wear a pair of dark-tinted glasses. Uncle Qi had a pair, but they were magical artifacts that could magnify things, used for observing microscopic changes in toxins.
Chapter 290