Many eye diseases such as glaucoma, diabetic eye disease and age-related macular degeneration have no early warning signs. A dilated eye exam is the only way to detect these diseases in their early stages. During the exam, eye drops are used to dilate the pupil to allow more light to enter the eye. This enables an eye care professional to view the back of the eyes and examine them for any signs of damage or disease. Your eye care professional is the only one who can determine if your eyes are healthy and if you are seeing your best.