Riddle

Keep doing me to avoid lens dryness. What am I?

Choose an answer

A.Yawning
B.Sneezing
C.Sweating
D.Blink
Hint: It's a word with 5 letters, starting with "B".

Answer

Blink

Why this is the answer

Blinking spreads moisture over the eye's surface (the lens), which is why blinking regularly prevents dry eyes.

This riddle is filed under "What Am I?" Riddles and rated Easy.