Femtosecond laser cataract surgery has many advantages, some of which can be better if the following operational details are taken care of. For example, the problem of subconjunctival hemorrhage. Because of the negative pressure ring suction, in some cases there will be bleeding under the conjunctiva after surgery, which does not affect the result, but affects the patient’s appearance. How can this be avoided? Let’s use the LenSx device as an example to illustrate. When doing a femtosecond cataract cut, the eye needs to be fixed and the cornea needs to be flattened so that the real-time OCT can be scanned accurately to determine the position and depth of the cut. When the flattening lens is approaching the cornea, do not rush to start negative pressure attraction. If you attract before you have fully compressed it, it will pull up the conjunctiva and easily lead to subconjunctival hemorrhage. It should be fully compressed and then attracted, it will reduce the pull on the conjunctival vessels and reduce bleeding. To determine if the pressure is good, one is to see if the cornea is fully in contact with the flattening lens and there is no more blistering. The second is to see if the pressure indicator bar on the right side is at the required green area. Only when it reaches the green area can the attraction start. (Figure 1) Figure 2: There is no bleeding in the conjunctiva after the attraction, and the femtosecond cut was successfully completed.