In cases of large retinal detachment and high augmentation, several fissures are often present and one cannot be satisfied with one fissure, especially one small fissure. 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 the 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 location 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, or striped, serrated-edge detached, or irregularly shaped. The detached retina can sometimes be so elevated that the lacunae are obscured, and the patient may be asked to change head position during the examination. The patient can also be bandaged and bedridden for 1 to 2 days, and then examined when the augmentation decreases. 1.Microscopic examination: Under a fully dilated pupil, the peripheral appearance of the retina can be examined with an indirect ophthalmoscope combined with scleral indentation or with a slit lamp and contact lens. 2.Fundus examination: The retina in the detached area can be seen to lose its normal red reflection and become gray or greenish gray, with slight tremor and dark red blood vessels crawling on the surface. The elevated retina looks like a hillock, and the elevation can obscure the optic disc and have 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. 3.Fundoscopic examination: the 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 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. If they cannot be found with binocular indirect ophthalmoscopy plus scleral compression, the eyes may be bandaged with pressure and the patient may be allowed to lie still for several days until the retina has calmed down slightly before re-examination.