Is a condition in which individuals may have relatively normal peripheral vision but are unable to see clearly what is right in front of them.

Macular degeneration is a condition in which individuals may have relatively normal peripheral vision but are unable to see clearly what is right in front of them. Macular Degeneration is the leading cause of vision loss, affecting more than 10 million Americans “ more than cataracts and glaucoma combined. At present, Macular Degeneration is considered an incurable eye disease. Macular Degeneration is caused by the deterioration of the central portion of the retina, the inside back layer of the eye that records the images we see and sends them via the optic nerve from the eye to the brain. The retina's central portion, known as the macula, is responsible for focusing central vision in the eye, and it controls our ability to read, drive a car, recognize faces or colors, and see objects in fine detail.

Ibelieve the answer is relative humidity  because it makes more sense that way. solar flares usually occur in space it doesn't affect the earth, well it could but it wont make a significant damage.  latitude is land it doesnt do anything. prevailing winds, i dont know the correct meaning for this but i doubt that affects the land so it has to be relative humidity.