Answer: Option B
Explanation:
Many depressants will slower down the pupil dilation contraction and dilation and because of this there is a painful and temporarily blinding.
This is because when there is less light in the room and once the pupil dilated because of dim, once there is a bright environment the pupil does not contracts very fast and because of intensity of light there is pain in the eyes.
The bright light causes temporary blindness in the eyes.
