Fact 1: Looking at bright objects has a negative impact on the eyes.

Fact 2: Outside, the sun is bright.

Given the two facts above, answer the question "Looking at what has a negative impact on the eyes?" with the following options: 
- disease
 - Pollution
 - Allergies
 - shadows
 - the Sun
 - sun's heat
 - the moon
 - the inside of eyelids


 

     the Sun    