This is almost impossible to see. You almost have to click on the photo and enlarge it to see what I’m trying to show here. This patient has an “epiretinal membrane”. It is a little wrinkle near the center of the macula. The macula is the part of the retinal that see’s your central vision. When you look at an object, that object is focused on your retina.
An epiretinal membrane is like a wrinkle that occurs on the innermost layer of the retina (actually the surface of the retina). This wrinkle occurs because of traction of the vitreous bag against the retina. The vitreous bag is the bag of liquid gel that fills up your eyeball.
If this wrinkle gets worse to the point where it disturbs the vision enough, surgery can be performed to “peel” the wrinkled membrane. Resulting vision is usually very good after this procedure.