Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 194

Help Guide
Interchangeable Lens Digital Camera
ILCE-7RM3A
α7RIII
Eye-Start AF (still image)
Sets whether or not to use autofocus when you look through an Electronic Viewfinder.
MENU → (Camera Settings1) → [ Eye-Start AF] → desired setting.
1
Menu item details
On:
Auto focusing starts when you look through the Electronic Viewfinder.
Off:
Auto focusing does not start when you look through the Electronic Viewfinder.
Hint
[ Eye-Start AF] is available when an A-mount lens and a Mount Adaptor (LA-EA2, LA-EA4) (sold separately) are attached.
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