1. What is UBM examination and what is its significance? Ultrasound biomicroscopy (UBM) is a B-type high-frequency ultrasound diagnostic instrument that allows real-time observation and study of the relevant anatomical structures of the living human eye with a resolving power that can reach the level of an ordinary optical microscope. It provides a non-invasive, high-resolution image of the anatomical structures of the atrial and ciliary body of the eye, allowing physicians to clearly observe the anterior segment of the eye that could not be examined with the naked eye and related equipment in the past. the UBM examination of the anterior segment of glaucoma patients can visually reveal the morphology of the iris surface and atrial angle surface, and can display the tissue structures associated with the atrial angle morphology (e.g., iris cross-section, iris root attachment location, posterior chamber morphology, posterior ciliary body morphology, and posterior chamber morphology). The UBM does not depend on illumination light and can be performed under any set lighting conditions, eliminating the influence of light on atrial angle findings and providing for real-time observation of the atrial angle. It is safe, non-invasive in nature and can provide physicians with very valuable clinical information. It guides the physician in making the correct diagnosis of the disease and provides accurate first-hand information for the selection of treatment options. 2. Who needs an eye ultrasound? Ultrasound detection of the eye is one of the methods to examine the condition of the eye when the refractive interstitial is unclear. When the refractive interstitial is unclear, white pupil syndrome, refractive interstitial, retinal and choroidal detachment, fundus bulges, ocular atrophy, unexplained vision loss and high intraocular pressure, suspected intraocular parasites and posterior sclerositis, postoperative shallow anterior chamber, vitreous clouding or blood accumulation; protrusion of the eye due to various causes, such as tumor, inflammation, vascular disease and pseudophakic protrusion; suspected ocular fasciitis, unexplained visual loss and ocular motility disorders; measurements of the lacrimal sac area, eyelid and orbital rim masses and ocular muscles and optic nerve; perforating eye injuries and posterior rupture injuries, foreign body characterization and magnetic tests, suspected intraorbital hematoma or emphysema; suspected inflammation, tumors, cysts, vascular malformations, direct arteriovenous traffic, etc. Interventional ultrasound refers to ultrasound-guided needle puncture biopsy, surgical guidance for removal of non-magnetic foreign bodies from the eye and on-stage exploration for ocular tumor surgery. More advanced ultrasound, with vitreous enhancement, can detect fine vitreous opacities and posterior detachment, which is more significant for vitreoretinal surgery. 3. What eye diseases are CT and MRI of the orbit suitable for? CT is also known as electron computed tomography; MRI is called magnetic resonance imaging in Chinese; MRI, like CT, is painless, non-hazardous, and highly sensitive, which is significant for the diagnosis of tumors and neurology and the development of treatment plans. Meanwhile, MRI contains unique chemical structure information, which is considered to have greater potential superiority than ultrasound and CT, but it is difficult to show soft tissue calcified spots and cannot directly show fracture lines and bone destruction. CT and MRI are adapted to the examination of the following eye diseases (1) ocular protrusion; (2) progressive visual impairment and visual field defects; (3) unexplained ocular muscle paralysis; (4) abnormal eye movements accompanied by nystagmus; (5) optic disc edema; (6) optic nerve atrophy; (7) post-traumatic visual acuity and visual field disorders, foreign body examination; (8) intraocular swelling; (9) etiological study of strabismus and amblyopia; (10) periorbital bone lesions on X-ray; (11) extraocular lesions suspected on ultrasonography; (12) headache, orbital pain, facial spasm.