Al 3ayn && Al 7asad are FACTS, you'll find inside my answer some verses and Ahadeeth about that.
First thing first, Al 3ayn.
The Arabic word al-‘ayn (translated as the evil eye) refers to when a person harms another with his eye. It starts when the person likes a thing, then his evil feelings affect it, by means of his repeated looking at the object of his jealousy.
There are ahadeeth from the Prophet peace and blessings of Allah be upon him which speak of the effects of the evil eye. For example it is narrated in al-Saheehayn that ‘Aa’ishah may Allah be pleased with her said:
The Messenger of Allah (peace and blessings of Allah be upon him) used to tell me to recite ruqyah for protection against the evil eye.
أخرج مسلم وأحمد والترمذي وصححه عن ابن عباس رضي الله عنهما عن النبي صلى الله عليه وسلم قال : " العين حق ولو كان شيء سابق القدر لسبقته العين ، وإذا استغسلتم فاغسلوا " صححه الألباني في السلسلة الصحيحة.
Allah commanded His Prophet Muhammad peace and blessings of Allah be upon him to seek refuge with Him from the envier, as He said (interpretation of the meaning).
Everyone who puts the evil eye on another is envious, but not every envier puts the evil eye on another. The word 7asid (envier) is more general in meaning than the word ‘aa’in (one who puts the evil eye on another), so seeking refuge with Allah from the one who envies includes seeking refuge with Him from the one who puts the evil eye on another.
The evil eye is like an arrow which comes from the soul of the one who envies and the one who puts the evil eye on another towards the one who is envied and on whom the evil eye is put; sometimes it hits him and sometimes it misses. If the target is exposed and unprotected, it will affect him, but if the target is cautious and armed, the arrow will have no effect and may even come back on the one who launched it.
Adapted from Zaad al-Ma’aad.
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Allah knows better.