The YAG laser is a highly specialised laser that is designed specifically for use in the eye and is safe to do so. It delivers light in a very focused manner, and it is essentially a cutting instrument.
Initially, they may simply be flashing lights and floaters. These flashing lights develop in the dark when you move your eye. It is often described as the lightning flash or a flicker that last for a view seconds.
In some patients for various reasons this lining starts separating from the eye surface. This process is called retinal detachment. The most common reason this happens is because the jelly structure, that lies immediately in front of the retina, starts collapsing in on itself.