To find out the prescription of your eyes, you need to go to the ophthalmology department of a regular hospital for an optometry examination. Adults over 18 years old can get the prescription of their eyes and the nature of their refractive error, such as whether they are myopic, farsighted or astigmatic, through computerized optometry. If you are under 18 years old, you will need to have a dilated eye exam. If the patient is under 10 years old and has a combined eye position abnormality, i.e., a combined strabismus, he or she will need a chronic pupil dilator with atropine cream to dilate the pupil at home for 3 days before going to the hospital for an optometric examination. If the child is between 10 and 18 years old, a rapid pupil dilator, or tropicamide, is used to dilate the pupil four times before the eye is examined to obtain an accurate eye prescription.