There are a few types of eye drops that could be used during an eye exam:
Eye drops that dilate (enlarge) the pupils are used in many examinations to enable Dr. Venn or Dr. Hannington to get a better view of the inside of the eye. The optometrist will decide how often this type of examination is necessary for each individual depending upon his or her symptoms, age, health, and family history. The drops generally leave your vision a little blurry and sensitive to light, so you may not be able to drive immediately after this procedure. The effect of the drops will wear off in 2 to 6 hours.
Eye drops that relax the focus of the eyes are used to accurately measure the degree of far-sightedness of the eyes. These are generally used, when necessary, for children and young adults. These drops also leave the vision blurry and sensitive to light.
Eye drops to anesthetize (numb) the eye are used for procedures that require an instrument touching the eye. The anesthetic does not affect vision and lasts about 15 minutes. Some eye drops contain a dye that helps the doctor diagnose abnormalities of the surface of the eye.