Nikon D780 DSLR Camera (Body Only) - Manual (Page 203)

157 Shooting Settings
D Face/Eye-Detection AF
• Eye detection is not available during movie recording.
• Eye and face detection may not perform as expected if:
- the subject’s face occupies a very large or very small proportion of the
frame,
- the subject’s face is lit too brightly or too poorly,
- the subject is wearing glasses or sunglasses,
- the subject’s face or eyes are obscured by hair or other objects, or
- the subject moves excessively during shooting.