alwalid bin abdulmalik used to order his sons not to cut their nails except on thursdays and saturdays and he said it was mentioned to me that whoever did that would not get conjunctivitis as long as he did that.
وكان الوليد بن عبد الملك يأمر بنيه ألا يقلموا أظفارهم إلا يوم الخميس والسبت ويقول ذكر لي أن من فعل ذلك لم يصبه رمد ما لزم فعل ذلك.