Ar - Rāzī, a ninth - century Persian considered by some to have been the greatest physician of the Islamic world of that time, wrote the first medically accurate description of smallpox.
अब डॉक्टर बगैर चीर - फाड़ किए मरीज़ के अंदरूनी हिस्सों की जाँच कर सकते थे ।