Final answer:
Exposure to certain chemicals or irritants can cause pain and gritting feeling in the eyes accompanied by spastic blinking of the eyelids.
Step-by-step explanation:
The symptoms described, including pain and gritting feeling in the eyes accompanied by spastic blinking of the eyelids, are typical of exposure to certain chemicals or irritants. These symptoms can occur due to exposure to substances such as tear gas, irritant gases, or household chemicals. When these substances come into contact with the eyes, they can cause irritation, redness, tearing, and involuntary blinking.