Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 185

The eye detection frame is not displayed when the Eye AF function is unavailable.
You cannot use the face/eye detection function with the following functions:
Zoom functions other than the optical zoom.
[Posterization] under [Picture Effect]
Focus Magnifier
When [ Frame Rate] is set to [120fps]/[100fps] during slow-motion/quick-motion shooting.
You cannot use the face detection function in the following situation:
Movie shooting with [
Up to 8 faces of your subjects can be detected.
Even if [Face Dtct Frame Dsp] is set to [Off], a green focusing frame will be displayed over faces that are in focus.
When the shooting mode is set to [Intelligent Auto], [Face/Eye Prty in AF] is locked to [On].
Even when [Subject Detection] is set to [Animal], the eyes of some types of animals cannot be detected.
Even when [Animal Eye Display] is set to [Off], a green focusing frame is displayed over eyes that are in focus.
Related Topic
Focus Mode
Focus Area
AF Area Auto Clear
Custom Key (still image/movie/playback)
Version
Record Setting] set to [120p]/[100p]
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