Research has shown that, for some people in some situations, it is safe to drive after having their eye dilated, according to WebMD. While having the eye dilated does not necessarily hamper a person's ability to drive, certain individuals, such as the elderly, are affected more than others.
Two additional factors that compound the effects of having the eye dilated are having glaucoma or a cataract, according to WebMD. Having one or both of these conditions is more likely to impair vision to the point it may not be safe to drive. Other factors include what specific tests were done and the traffic conditions along the route. If a person has doubts about her ability to drive, it is best for her to plan ahead and ask someone else to drive.