For a wizard, preparing new spells at the end of a long rest seems to require studying their spellbook (emphasis added):
You can change your list of prepared spells when you finish a long rest. Preparing a new list of wizard spells requires time spent studying your spellbook and memorizing the incantations and gestures you must make to cast the spell: at least 1 minute per spell level for each spell on your list.
Assuming a wizard’s spellbook is a mundane book or other written medium, does this mean that they cannot prepare new spells if they are blinded at the end of a long rest? What if their spellbook is something more exotic, such as a spellshard?