Children between the ages of 1 and 7 years, who presented for a routine eye examination, were recruited to participate. Each child received 1% cyclopentolate in the right eye (group A), and either tetracaine with cyclopentolate (group B) or tetracaine with cyclopentolate with phenylephrine (group C) in the left eye. At the completion of the examination, a digital picture was taken of the patient's pupils. A separate observer measured the pupil diameter and classified iris color.