There is no harm for the fasting person to apply kohl, or to put drops into his eyes, likewise to put drops into his ears, even if he was to find its taste in his throat.
Sallām bin Abī Muṭīʿ stated that he would rather meet Allāh with the scroll of al-Ḥajjāj than with the scroll of ʿAmr bin ʿUbayd, who is the head of the sect of the Muʿtazilah.
The Salaf used to seek knowledge for the sake of Allāh, and they were ennobled and then became Imāms of Guidance, by whom the people guided themselves.
If we were to say that there is no rejection to be shown in issues of difference in an unrestricted manner, then the religion as a whole would disappear...