diff --git a/app/src/main/res/raw/tiltshift_fragment.glsl b/app/src/main/res/raw/tiltshift_fragment.glsl
index e05ee2c..86c4d99 100644
--- a/app/src/main/res/raw/tiltshift_fragment.glsl
+++ b/app/src/main/res/raw/tiltshift_fragment.glsl
@@ -29,6 +29,12 @@ float linearFocusDistance(vec2 uv) {
     vec2 center = vec2(uPositionY, 1.0 - uPositionX);
     vec2 offset = uv - center;
 
+    // Correct for screen aspect ratio to make coordinate space square
+    // After transform: offset.x = screen Y direction, offset.y = screen X direction
+    // Scale offset.y to match the scale of offset.x (height units)
+    float screenAspect = uResolution.x / uResolution.y;
+    offset.y *= screenAspect;
+
     // Adjust angle by +90 degrees to compensate for the coordinate transformation
     // The position transform is a 90° CW rotation, so angles transform as θ + 90°
     float adjustedAngle = uAngle + 1.5707963;
@@ -49,10 +55,11 @@ float radialFocusDistance(vec2 uv) {
     vec2 center = vec2(uPositionY, 1.0 - uPositionX);
     vec2 offset = uv - center;
 
-    // Adjust for aspect ratio to create ellipse
-    // Correct for screen aspect ratio first
+    // Correct for screen aspect ratio to make coordinate space square
+    // After transform: offset.x = screen Y direction, offset.y = screen X direction
+    // Scale offset.y to match the scale of offset.x (height units)
     float screenAspect = uResolution.x / uResolution.y;
-    offset.x *= screenAspect;
+    offset.y *= screenAspect;
 
     // Apply rotation
     // Adjust angle by +90 degrees to compensate for the coordinate transformation