A16: Fast is affected by what reaches the gut; anything that does not reach the gut has no effect on fast. However, it is known that the eye drains into the throat; therefore use of eye drops should be confined to cases of constraint and to the extent that is necessary, ie to the extent that the eye absorbs the drop completely and nothing of it is left to reach the throat. Such precaution should be taken, and the use should only be in cases of constraint not in cases of choice; for what is allowed in cases of constraint is not allowed in cases of choice. And Allah knows best.
