The doll was very old, its dress was faded, its hair was tangled, and one of its eyeballs was missing, revealing a dark hole. But I noticed: there was no pupil in the doll's other eye, just a white plastic side.
I subconsciously recalled doing a fire drill in a toy store when I was selling fire equipment. The boss of that toy store told me that dolls produced by regular manufacturers must have pupils and irises in their eyes. This is a toy safety standard enforced by the state.