Reference for Pesachim 222:11
אמר רב יוסף הני תלת מילי יהיב ארבונא לנהורא מן דסריק רישיה יבש ומן דשתי טיף טיף ומן דסיים מסני אדמייתניה כרעא
until the sixteenth they are certainly to be found; henceforth it is doubtful whether they are about or not, and they are found in the shadow of hazabe<span class="x" onmousemove="('comment',' A species of shrub.');"><sup>18</sup></span> which have not grown a cubit, and in the morning and evening shadows when these are less than a cubit [in length], but mainly in the shadow of a privy. R'Joseph said: The following three things cause defective eyesight: combing one's head [when it is] dry, drinking the drip-drop [of wine], and putting on shoes while the feet are still damp. [Eatables] suspended in a house lead<span class="x" onmousemove="('comment',' Lit., 'are harmful.'');"><sup>19</sup></span>