My grandson had his eyes dilated this morning and the ophthalmologist stated it could take up to 24 hours before the eyes return to normal. Is this true?

It depends upon which eye drops were used and the color of his eyes. Pupil dilation tends to last longer in people with lighter colored eyes and occasionally the child’s eyes may remain dilated longer than 24 hours. The duration of action is specific to the drug used. Also, if two different classes of drugs were employed, the results will last longer. His ophthalmologist can tell you most accurately what to expect based on the drug that was used. Responses to any drug may produce different effects in individuals.