Acts 9:8

Verse 8. When his eyes were opened. He naturally closed them at the appearance of the light; and in his fright kept them closed for some time. He saw no man. This darkness continued three days, Ac 9:9. There is no reason to suppose that there was a miracle in this blindness, for in Ac 22:11, it is expressly said to have been caused by the intense light: "And when I could not see for the glory of that light," etc. The intense, sudden light had so affected the optic nerve of the eye as to cause a temporary blindness. This effect is not uncommon. The disease of the eye which is thus produced is called amaurosis, or, more commonly, gutta serena.