«وَيُجْتَنَبُ أَكْلُ اللَّيْلِ الَّذِي يُعْشِي»
And one should avoid a night meal believed to dim the sight.
Yuʿshī is linked to deficient or dim vision; it resonates with ʿashāʾ, the evening meal. The closeness of sound creates wordplay.
This is a traditional literary formulation used to support the visitor’s point. It is not evidence that every late meal causes visual impairment.