In order to make a better diagnosis and treatment, doctors often ask patients to do a variety of clinical tests, and ophthalmology is no exception. Today we will popularize three common tests in ophthalmology, hoping that you will have a clearer understanding of their role: 1. Dilated pupil examination Because lesions of the sugar retina often appear in the peripheral part of the retina, it is difficult to detect them without dilating the pupil, so dilated pupil examination is very necessary. Usually doctors will use a rapid pupil dilating medicine. After dilating the pupil, patients will feel some blurring and shaking of the eyes, but its effect only lasts for 5-8 hours and will not affect their vision after the medicine wears off. 2.OCT examination of ophthalmology OCT examination of ophthalmology is a non-invasive eye examination, which is very helpful for early detection of macular edema caused by diabetes and is often more accurate than the doctor’s naked eye judgment. For some patients who have vision loss or visual distortion, if macular edema is suspected, OCT examination must be done. 3. Fundus fluorescence angiography Fundus fluorescence angiography can be used to detect lesions that are difficult to see with the naked eye, such as vascular leakage, neovascularization and retinal ischemic areas, by observing the blood vessels in the fundus according to the angiography. If the lesion has reached a certain level of severity, the doctor will often recommend fundus fluoroscopy to determine if laser treatment is needed.