Eye trouble[1]
שלש פעמים בשנה יראה כל זכורך אל פני האדון יקוק
All of your males shall appear, three times a year, before The Lord, Hashem[2]
In conjunction with the three major Festivals, Pesach, Shavuos, and Sukkos, there is a mitzvah to “appear” in the Temple, before G-d. That is, all males should make the effort to personally bring a special offering in the Temple, in honor of the Festival. The gemarra makes an in interesting derivation[3]. The Torah uses the word יראה, which could be read “shall be seen”, and also read “shall see”. As such, we derive that just like we “shall be seen” so-to-speak by Hashem with “two eyes”, so too we “shall see” with two eyes. Namely, someone who is blind in one eye is exempt from this mitzvah, for whatever reason[4].