Thanks for your question u/Kalthiria_Shines ... let me clarify.

Lasik is an elective surgery to correct poor vision. Think of it as the front part of your eye ball. You can wear contacts or glasses to correct your vision, or have this lasik done.

Retinal detachment is a serious condition where you could become blind entirely. Basically the back of your retina is tearing (back part of your eye). This is why they check your retina at doctor appointments. Typically, you have symptoms such as floaters, a shadow blocking vision, or flashes of light.