Spatial orientation of person/object from viewer's perspective — distinct from camera/actor's right. Governs eye-line and cutting logic.
You look at the monitor and see a figure standing on the left side of the frame. That is not their right—that is your right as the viewer. Screen Right refers precisely to this perspective: the spatial orientation of people and objects, measured from the screen, not from the actor or the camera. A common mistake beginners make is confusing Screen Right with Actor's Right (where the actor themselves is standing) or Camera Right (where the camera's position is). This leads to jump cuts and convoluted edits when you jump between shots.
Practically: You are shooting a conversation scene between two actors. The man is on Screen Left, the woman on Screen Right. In the over-the-shoulder shot series, you must maintain this orientation—otherwise, the man suddenly jumps to the other side, and the viewer loses spatial logic. The eye orients itself based on who is sitting where in the frame. If you change the camera in the next shot (e.g., closer), the screen position remains the same. The man is still on the left, the woman on the right—from our perspective.
This becomes critical with so-called axis crossing or violating the 180-degree rule (see also: Continuity Editing, Eyeline Match). If you cross the invisible line between the two figures and place the camera on the wrong side, the spatial orientation flips. Suddenly, the man is on the right. This creates conscious or unconscious disorientation—sometimes desired for tension or psychological unease, but usually a mistake.
A practical tip: Mark on the monitor or in your mental spatial layout who is sitting left and right—always from the viewer's perspective. Note it in your script as an L/R diagram. When you later plan reverse shots or discuss the editing flow with the editor, you will have a common language. In editing itself, this becomes crucial: a sequence with consistent Screen Right flows and appears logical. One with a disorienting jump cut due to a break in orientation destroys immersion—unless that is your intention.