Does the subject want to ask "what is the reason for the layer edge in the red eye of peony gold thread?" Reflection, pigmentation.

1, light reflection: peony golden red eyes have a special reflective structure, which makes the light reflect after entering the eyes and form a halo. This phenomenon is called "glare" or "halo".

2. Pigmentation: Pigmentation exists in the eyes of peony golden red, and these pigments will form layers of colored stripes or spots.