Eye dilation is done on almost all routine eye exams. Expanding the pupil, allows any doctor to take an un-obstructed view of all of the internal eye structures, probably the most important part of an eye exam. Viewing the back of the eye allows to check for any medical condition of the eye. Most often we can detect diabetes, glaucoma, or any circulatory abnormality. There is a new technology of retinal scanning with optos. In some cases we can obtain a very precise digital image of the eye precludes us from having to do a dilated eye exam.