The early symptoms of cataracts can manifest as day blindness or night blindness. When the cloudiness of the lens originates from the middle of the eye, the strong daylight and illumination can cause the pupil to contract, which then blocks the light from entering the eye, resulting in day blindness. When the cloudiness of the lens is located around the periphery of the eye, the dim light at night cannot reach the peripheral retina, thus causing night blindness. Other early symptoms of cataracts include the following: when the cloudiness of the lens is located at the pupil, patients may see fixed dots or patches of shadow in front of their eyes. However, since cataracts share similar characteristics with floaters, they should be distinguished; the shadows in floaters can move, while the shadows in cataracts are fixed. Varying degrees of blurry vision are also early symptoms of cataracts. Patients may experience gradually increasing blurriness of vision, often perceiving halos around lights or seeing colors of objects as dull and unclear. The early development of cataracts is quite slow and can be determined by the deepest and most obvious part of the lens cloudiness and its development condition.