When suffering from orbital foreign body disease, the following related examinations are required: 1. CT scan: CT scan: According to the experiment metal foreign body CT value is greater than +3000H, glass CT value +300~600Hu, plastic CT value 0~20Hu, wood CT value -199~50Hu. CT can show deep or superficial orbital metal foreign body, and the smallest displayable Because the metal density is much higher than the intraorbital fat, the contrast is large and easy to be detected, and radiographic artifacts often appear. It affects the accurate localization of foreign bodies. For foreign bodies adjacent to the bulb wall it is difficult to determine whether they are intra- or extra-bulbar, and for multiple intraorbital foreign bodies, artifacts of larger foreign bodies can obscure smaller foreign bodies. Vegetative foreign bodies have negative CT values, and the foreign body does not show clearly in a background where the fat is also hypodense, and even foreign bodies up to 2.5 mm × 2.5 cm remain undetectable. After the formation of granuloma or fibrous envelope around the foreign body, the CT value of its fibrous wall is high and it shows high density. If the foreign body is large and surrounded by bleeding, the sarcoid high-density area is contrasted and the vegetative foreign body shows as a low-density area. When the foreign body is small, it is difficult to show the foreign body as a result of the foreign body being wetted by tissue fluid and volume averaging. If there are other high-density objects, such as pencil, within the woody foreign body, it can be shown. 2.MRI examination: The display of non-magnetic foreign bodies in the orbit, especially vegetative foreign bodies, is better than CT. intraorbital fat is high signal while foreign bodies are low signal or no signal, which can be easily detected in T1WI. 3.Eye and orbital examination method is usually performed by visualization under natural light. When examining the eye, attention should be paid to the size, shape, protrusion or posterior sink, and the position of the eye, and whether there is involuntary nystagmus. 95% of tumors can be diagnosed qualitatively, but ultrasound is poor in showing bone tissue, so some tumors cannot show their size and whether they invade the bone wall. Therefore, it is necessary to combine with other imaging examinations, such as CT and MRI, to make a comprehensive diagnosis. 4.Ophthalmic examination General examination of the eye, including examination of the appendages and the anterior segment of the eye. The main purpose is to look at the visual function of the macula. Generally, people think that normal vision means being able to see 1.5 or 1.0 in the visual acuity table, but in fact the standard of checking whether the vision is normal or not is: whether the vision can reach the standard after correction, i.e. whether the vision can reach the standard after optometry and glasses.