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

Fact 2: Eye and dental disorders sometimes cause headaches.

Given the two facts above, answer the question "what can cause headaches" with the following options: 
- cloudy and rainy weather
 - hyperthyroidism
 - prolactin release
 - Damaged hearing
 - The bending of a ray of light
 - Leptospirosis
 - Warm air moving into cold air
 - looking at bright objects


 

        looking at bright objects 