وفر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.

اشترك الآن

تمت عملية الاشتراك بنجاح

إغلاق

عذراً، عذرا،أنت مشترك مسبقاً بالنشرة البريدية

إغلاق

عذراً، هناك مشكلة في البريد الالكتروني

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get_post_type: string(7) "concept"

الطب

العمى الليلي(العشى الليلي) |  Night blindness

26 أبريل 2020


وهو اضطراب في الرؤية يظهر بعدم تمكن العين من الرؤية الواضحة بالليل او في الضوء الخافت ويعود الى خلل في شبكية العين وراثي او بسبب مرض عيني ما او بسبب نقص فيتامين A .