It usually takes about half an hour to dilate the pupil to check the fundus, and the specific time is related to the severity of the patient’s condition and the skill of the doctor. When checking the patients need to first point in the eye pupil-dilating drugs, usually about half an hour after the use of drugs, the pupil can be fully dilated, at this time for the fundus examination, and the fundus examination itself is relatively fast, through the fundoscopy or fundus color phase of the examination, usually about 5-10 minutes, if the patient’s condition is serious or the doctor is not skilled enough, then the time will be longer. Dilated pupil examination refers to the use of pupil-dilating drugs, such as compound tropicamide eye drops to paralyze the pupil sphincter, so that the pupil diameter is enlarged, which enables the doctor to more comprehensively and in detail check the condition of the fundus of the eye, i.e., the health of the retina, vitreous body and choroid, and is often used in the ophthalmological examination of patients with fundopathy. It is recommended that patients with abnormal funduscopic exams seek prompt medical attention to evaluate their condition and follow doctor’s instructions for treatment.