The eardrum is a thin membrane that separates your ear canal (the part that is open to the outside) from your middle ear. Sound waves cause your eardrum to vibrate. These vibrations in the eardrum are then carried and processed by other parts of the ear. However this eardrum can rapture causing hearing loss.
Ruptured eardrumA ruptured eardrum (tympanic membrane perforation) is a hole or tear in the thin tissue that separates your ear canal from your middle ear (eardrum). A ruptured eardrum can result in hearing loss. It can also make your middle ear vulnerable to infections. A ruptured eardrum usually heals within a few weeks without treatment. But sometimes it requires a patch or surgical repair to heal.
A raptured eardrum causes hearing loss. This was known recently, however this was portrayed in the Quran 1400 years ago.
٢٥ وَمِنْهُمْ مَنْ يَسْتَمِعُ إِلَيْكَ ۖ وَجَعَلْنَا عَلَىٰ قُلُوبِهِمْ أَكِنَّةً أَنْ يَفْقَهُوهُ وَفِي آذَانِهِمْ وَقْرًا ۚ وَإِنْ يَرَوْا كُلَّ آيَةٍ لَا يُؤْمِنُوا بِهَا ۚ حَتَّىٰ إِذَا جَاءُوكَ يُجَادِلُونَكَ يَقُولُ الَّذِينَ كَفَرُوا إِنْ هَٰذَا إِلَّا أَسَاطِيرُ الْأَوَّلِينَ
"Waqr وَقْرًا ۚ" means tear or crack. In this verse tear in the ears prevent you from hearing. Today we know that a tear in the eardrum causes hearing loss.
How could an illiterate man who lived 1400 years ago have known that a tear in your ear causes hearing loss?
The Quran (Koran, the book of Islam) contains scientific knowledge that could not have been known 1400 years ago. It ranges from basic arithmetics to the most advanced topics in astrophysics. You are invited to go through those miracles and judge for yourself.