The periphery of the presenting retina can be examined under fully dilated pupils with indirect ophthalmoscopy combined with scleral depression or with a slit lamp and contact lenses. Funduscopic examination reveals that the retina in the detached area has lost its normal red reflection and is gray or greenish-gray in color, with a slight tremor and dark red blood vessels crawling on the surface. The elevated retina looks like a rolling hillock, and the elevation is extensive enough to obscure the optic disk with folds. Flat detachment, if not detailed examination is often easy to miss the diagnosis. Macular detachment, macular center of the concave was a red spot, and the nearby gray-white detachment of the retina to form a sharp contrast. Fundoscopy is most important. The detection of all retinal tears is not only the basis for the diagnosis of foraminal retinal detachment, but also one of the keys to the success of surgery. Therefore, it is extremely important to be able to accurately and invariably find all the lacunae. Approximately 80% of all detachments occur in the peripheral portion of the fundus, with supratemporal detachments being particularly common, followed by inferotemporal detachments, supranasal detachments being even less common, and inferonasal detachments being the least common. These peripheral lacunae are often obscured when the retinal detachment is elevated and must be carefully sought from all angles. In the case of bimanual indirect ophthalmoscopy with scleral compression still can not be found, pressure bandaging of both eyes, let the patient lie down for a few days, until the retina is slightly calmed down before examination. In retinal detachment with a large area and a high degree of elevation, several fissures are often present, and one cannot be satisfied with one fissure, especially a small one. In addition to looking for a fissure in the detached area, attention should also be paid to areas of non-detachment or inconspicuous detachment, especially in the superior fundus fissure, where the fissure and its vicinity may not always be visible due to fluid subsidence. The location and morphology of the retinal detachment sometimes favors the search for a lacrimal hole. If the fundus is detached above, the lacunae are always within the detached area above; if the detachment is hemispherical, the lacunae may be directly above; if the detachment is extensive below, the lacunae may be above the higher side of the edge of the detached area; and if the height of the two sides is essentially the same, the lacunae are often in the peripheral area below them. Patient complaints can sometimes provide clues as to where to look for the fissure. The first dark areas and flashes of light in the visual field are often located in the same place as the lacunae. Retinal detachment is a common finding. Finding the lacunae and surgically closing them is the key to treating the disease. The fissure is reddish in color with a grayish-white surrounding retina and is most often found in the superior temporal region, followed by the inferior temporal region, and least often in the nasal region. Serrated margins of the fissure, most often in the inferotemporal or inferior, the fissure can also occur in the macula or not yet detached retina, fissures vary in size and number. They may be round or horseshoe-shaped, or striated, serrated-edge detached, and irregularly shaped. The detached retina is sometimes highly elevated to obscure the lacunae, and the patient may be asked to change the head position during examination. You can also bandage both eyes and stay in bed for 1 to 2 days, and check again when the elevation decreases.