Retinal detachment itself is painless. But warning signs almost always appear before it occurs or has advanced, such as:  The sudden appearance of many floaters — tiny specks that seem to drift through your field of vision Flashes of light in one or both eyes (photopsia) Blurred vision Gradually reduced side (peripheral) vision A curtain-like shadow over your field of vision 
retinal detachment painless  warning signs occurs advanced  as:  sudden appearance floaters — tiny specks drift field vision flashes light eyes (photopsia) blurred vision gradually reduced side (peripheral) vision curtain-like shadow field vision 
retinal detachment