طَحُورَانِ عُوَّارَ الْقَذَى فَتَرَاهُمَا
كَمَكْحُولَتَيْ مَذْعُورَةٍ أُمِّ فَرْقَدِ
The two eyes clear away troublesome specks of dust; they resemble the naturally dark-rimmed eyes of a frightened wild cow with her young.
Ṭaḥūrān ʿuwwār al-qadhā conveys the eyes’ freedom from irritating dust. The adjective makḥūlatayn describes an apparent kohl-like dark rim; it need not imply that cosmetics were literally applied.
Madhʿūrah umm farqad is a frightened mother wild animal with its young. Her eyes provide a vivid model of openness, alert attention, and natural dark-rimmed appearance. The simile is about an observable expression, not an identification of the camel with the wild cow.