diff --git a/src/modality-agnostic-files/events.md b/src/modality-agnostic-files/events.md
index e5335a7818..5aa206bce8 100644
--- a/src/modality-agnostic-files/events.md
+++ b/src/modality-agnostic-files/events.md
@@ -267,7 +267,9 @@ and a guide for using macros can be found at
 !!! warning "Important"
 
     Some metadata of the `StimulusPresentation` object become REQUIRED with the presence of
-    [eye-tracking data](../modality-specific-files/physiological-recordings.md#eye-tracking)
+    "gaze-on-screen"
+    [eye-tracking data](../modality-specific-files/physiological-recordings.md#eye-tracking),
+    as identified by the `"SampleCoordinateSystem"` metadata.
 
     The following fields pertaining to `<matches>_events.json` of tasks that were acquired
     with the simultaneous recording of eye-tracking escalate to REQUIRED as they are considered
diff --git a/src/modality-specific-files/physiological-recordings.md b/src/modality-specific-files/physiological-recordings.md
index 65f58154d9..fd9c726c92 100644
--- a/src/modality-specific-files/physiological-recordings.md
+++ b/src/modality-specific-files/physiological-recordings.md
@@ -539,9 +539,9 @@ those derived from the saccade and blinks model some eye-trackers produce.
 
 !!! warning "Important"
 
-    The following fields pertaining to `<matches>_events.json` of tasks that were acquired
-    with the simultaneous recording of eye-tracking escalate to REQUIRED as they are considered
-    essential in eye-tracking data analysis:
+    For eye-tracking recordings where `"SampleCoordinateSystem"` is set to `"gaze-on-screen"`,
+    the following fields pertaining to `<matches>_events.json` escalate to REQUIRED
+    as they are considered essential in eye-tracking data analysis:
 
     -   `StimulusPresentation.ScreenDistance`,
     -   `StimulusPresentation.ScreenOrigin`,
diff --git a/src/schema/objects/metadata.yaml b/src/schema/objects/metadata.yaml
index 1ac84bfc36..e54326c215 100644
--- a/src/schema/objects/metadata.yaml
+++ b/src/schema/objects/metadata.yaml
@@ -3592,7 +3592,7 @@ ScreenResolution:
     (for example `[1920, 1200]` for a screen of 1920-width by 1080-height pixels),
     if no screen use `n/a`.
     `ScreenResolution` is REQUIRED when the experiment included simultaneous eye-tracking
-    recordings.
+    recordings with `SampleCoordinateSystem` matching `"gaze-on-screen"`.
   anyOf:
     - type: array
       items:
@@ -3610,7 +3610,7 @@ ScreenSize:
     (for example `[0.472, 0.295]` for a screen of 47.2-width by 29.5-height cm),
     if no screen use `n/a`.
     `ScreenSize` is REQUIRED when the experiment included simultaneous eye-tracking
-    recordings.
+    recordings with `SampleCoordinateSystem` matching `"gaze-on-screen"`.
   anyOf:
     - type: array
       items:
@@ -4005,21 +4005,6 @@ StimulusPresentation:
       $ref: objects.metadata.SoftwareVersion
     Code:
       $ref: objects.metadata.Code
-StimulusPresentation__eyetrack:
-  $ref: objects.metadata.StimulusPresentation
-  required:
-    - ScreenDistance
-    - ScreenOrigin
-    - ScreenResolution
-    - ScreenSize
-  recommended:
-    - OperatingSystem
-    - ScreenRefreshRate
-    - SoftwareName
-    - SoftwareRRID
-    - SoftwareVersion
-    - Code
-    - HeadStabilization
 StopTime_eyetrack:
   name: StopTime
   display_name: Eye-tracking recording stop time
diff --git a/src/schema/rules/checks/eyetrack.yaml b/src/schema/rules/checks/eyetrack.yaml
index c4b5690df0..3f9b24ff39 100644
--- a/src/schema/rules/checks/eyetrack.yaml
+++ b/src/schema/rules/checks/eyetrack.yaml
@@ -10,11 +10,12 @@ EyetrackingStimulusPresentation:
     - suffix == 'physio'
     - extension == '.tsv.gz'
     - sidecar.PhysioType == 'eyetrack'
+    - sidecar.SampleCoordinateSystem == 'gaze-on-screen'
   checks:
-    - '"ScreenDistance" in associations.events.sidecar.StimulusPresentation'
+    - associations.events.sidecar.StimulusPresentation.ScreenDistance != 'n/a'
     - '"ScreenOrigin" in associations.events.sidecar.StimulusPresentation'
-    - '"ScreenResolution" in associations.events.sidecar.StimulusPresentation'
-    - '"ScreenSize" in associations.events.sidecar.StimulusPresentation'
+    - associations.events.sidecar.StimulusPresentation.ScreenResolution != 'n/a'
+    - associations.events.sidecar.StimulusPresentation.ScreenSize != 'n/a'
 
 OnsetSourceConsistency:
   issue: