Chase has had difficulty sleeping recently and gets frequent sinus headaches. He discovered that he is squinting more when he reads. His grades at school have also been dropping. Which symptom might warrant a trip to an eye specialist?

difficulty sleeping
falling grades in school
frequent sinus headaches
squinting more while reading

As you sit in the library with your friend studying for your weekly quiz on the integumentary system, you come upon an article about the hazards of prolonged exposure to the sun's rays. your curious nature leads you to research the subject further. you're fascinated to learn that minimal exposure to the sun allows you skin to manufacture vitamin d, which is important to maintain homeostasis. you also read that although sunscreen can protect you from the ultraviolet (uv) rays of the sun, some medications can actually increase a person's sensitivity to the sunlight.