For example, H-Cl has a dipole. The electrons spend more of their time near the Cl atom (the red end in the diagram below). A dipole-dipole interaction is the attraction between two polar molecules. When they approach each other, the negative end one molecule attracts the positive end of the other.
Eyes sensitive to light can also be caused by viruses or inflammation, such as those found in sinus infections. If you have a cough, aching jaw, blocked nose, headaches and lethargy then it's best to visit your GP for a diagnosis of a possible sinus infection and simple antibiotic treatment.
What causes light sensitivity (photophobia)? Light sensitivity can be caused by lots of different things. Having an eye condition or migraines and getting older are some of the more common reasons. Some people are just naturally more sensitive to light than others without there being a cause. Our information concentrates on light sensitivity caused by eye conditions, but the ideas may also help for people without any eye conditions.