The periphery of the retina can be examined with an indirect ophthalmoscope combined with scleral indentation or with a slit lamp and contact lens under sufficiently dilated pupils. Funduscopic examination reveals that the retina in the detached area has lost its normal red reflection and is gray or greenish gray with slight tremor and dark red vascular crawling on the surface. The elevated retina resembles a hillock, and the elevation may obscure the optic disc with creases if it is extensive. Flat detachments are often easily missed if not examined in detail. In the case of macular detachment, the central macula is a red dot, which contrasts with the nearby gray-white detached retina. Fundoscopic examination is most important. The detection of all retinal fissures is not only the basis for the diagnosis of foraminal retinal detachment, but also one of the keys to the success or failure of surgery. Therefore, it is extremely important to be able to find all the fissures accurately and without missing them. Roughly 80% of the fissures occur in the peripheral part of the fundus, especially on the superior temporal side, followed by the inferior temporal side, followed by the superior nasal side, and least on the inferior nasal side. When the retinal detachment is elevated, these peripheral fissures are often obscured and must be carefully searched from all angles. In the case that they cannot be found with binocular indirect ophthalmoscopy and scleral compression, the eyes can be bandaged with pressure, and the patient can lie still for several days and be examined again after the retina has calmed down slightly. In cases of large retinal detachment and high augmentation, several fissures are often present and one fissure, especially one small one, cannot be satisfied. In addition to looking for fissures in the detached area, attention should also be paid to the un-detached or inconspicuous area of detachment, especially the above fundus fissure, where retinal detachment is not always seen in and around the fissure due to fluid subsidence. The location and shape of the retinal detachment sometimes facilitates the search for a fissure. For superior fundus detachment, the fissure is always within the superior detachment zone; for inferior detachment, if the detachment is hemispherically elevated, the fissure may be directly above it; for extensive detachment below, the fissure may be above the higher side of the edge of the detachment zone; and if both sides are essentially the same height, the fissure is often at its lower periphery. Patient complaints can sometimes provide some clues to finding the lacunae. The location of the first dark area and flash in the visual field is often the site of the lacunae. Lacerations are often found in retinal detachments. Finding the lacunae and surgically closing them is the key to treating this disease. The lacunae are red in color with a grayish-white surrounding retina and are most often found in the superior temporal area, followed by the inferior temporal area, and least often in the nasal area. The lacunae in the serrated rim are mostly in the infratemporal or inferior part of the retina. The lacunae can also occur in the macula or in the retina that has not yet detached. They can be round or horseshoe-shaped, but also striped, serrated-edge detached and irregularly shaped. The detached retina is sometimes so elevated that it can obscure the lacunae, and the patient may be asked to change the head position during the examination. The patient may be asked to change the head position during the examination. The eyes may also be bandaged and bedridden for 1 to 2 days, and then examined when the elevation decreases.