Clinical features of choroidal melanoma include: 1. Substantial tumors with varying shades of brown or gray pigmentation are visible in the fundus. 2, B-mode ultrasound tumor with myxoid or dome-like growth; low to moderate internal reflection with or without acoustic attenuation and choroidal excavation sign; choroidal depression sign; and a large height-to-base ratio. 3, FFA: hypofluorescence at the early lesion, patchy leakage at the later stage, and double circulation phenomenon can be seen in some cases. 4.ICGA: some cases can show the tumor blood vessels. 5.CT: It shows slightly high density, CT value 66-85HU, clear boundary and more uniform density. There is no characteristic performance, and it is easy to misdiagnose by CT alone, such as example 1 in this paper. 6.MRI: It is characteristic, and the tumor tissue has high or equal signal in T1WI and low signal in T2WI. The main reason is that melanoma contains melanin which is a kind of paramagnetic material resulting in shortened T1T2 value, so it is opposite to other tumor signals, which can be used as a basis for confirming the diagnosis. The progression of choroidal melanoma is generally divided into 4 stages: asymptomatic stage; glaucomatous stage; extraocular extension stage; and metastatic stage. For the discovery of unexplained vision loss or absolute stage glaucoma ultrasonography should be routinely done for the early detection of occult malignant tumors in the eye. For intraocular lesions causing protrusion of the eye, all intraocular tumors should be suspected of intraorbital spread, and early imaging should be performed for clear diagnosis and early treatment. Melanoma is divided into 3 categories according to diameter: large tumors (height >5mm, basal diameter >16mm); medium size (height between 3-5mm, basal diameter 10-16mm); and small tumors (height <3mm, basal diameter <10mm). After a lot of research in the past two decades, there have been new advances in the treatment of choroidal melanoma, and the available treatment methods include observation and follow-up, local tumor resection, ophthalmic removal, enucleation of ocular contents, radiation therapy (dressing radiation therapy, stereotactic radiation therapy), thermotherapy, photocoagulation, photodynamic therapy, chemotherapy and immunotherapy, but the treatment effect still needs further research. COMS believes that ophthalmic removal after radiation therapy has no significant impact on patient complications and mortality, and recommends ophthalmic removal alone from a health economics perspective. Indications for this procedure include: 1. The tumor invades the optic disc or macula and the visual prognosis is no longer too good. 2. The tumor is growing rapidly or metastasis has occurred. 3. Tumor with basal diameter greater than 10 or 11 mm, or invasion to the ciliary body or iris. 4.Tumor recurrence after conservative treatment. For severe extraocular spread of melanoma, orbital content enucleation can be used.