diff --git a/src/openseadragon.js b/src/openseadragon.js
index de88f717..fd3fe809 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -266,6 +266,9 @@
   * @property {Number} [pixelsPerWheelLine=40]
   *     For pixel-resolution scrolling devices, the number of pixels equal to one scroll line.
   *
+  * @property {Number} [pixelsPerArrowPress=40]
+  *     The number of pixels viewport moves when an arrow key is pressed.
+  *
   * @property {Number} [visibilityRatio=0.5]
   *     The percentage ( as a number from 0 to 1 ) of the source image which
   *     must be kept within the viewport.  If the image is dragged beyond that
@@ -1088,6 +1091,7 @@ function OpenSeadragon( options ){
             smoothTileEdgesMinZoom: 1.1, //-> higher than maxZoomPixelRatio disables it
             iOSDevice:              isIOSDevice(),
             pixelsPerWheelLine:     40,
+            pixelsPerArrowPress:    40,
             autoResize:             true,
             preserveImageSizeOnResize: false, // requires autoResize=true
             minScrollDeltaTime:     50,
diff --git a/src/viewer.js b/src/viewer.js
index 78872afc..51b22756 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -2483,7 +2483,7 @@ function onCanvasKeyDown( event ) {
                 if ( event.shift ) {
                     this.viewport.zoomBy(1.1);
                 } else {
-                    this.viewport.panBy(this.viewport.deltaPointsFromPixels(new $.Point(0, -40)));
+                    this.viewport.panBy(this.viewport.deltaPointsFromPixels(new $.Point(0, -this.pixelsPerArrowPress)));
                 }
                 this.viewport.applyConstraints();
                 return false;
@@ -2491,16 +2491,16 @@ function onCanvasKeyDown( event ) {
                 if ( event.shift ) {
                     this.viewport.zoomBy(0.9);
                 } else {
-                    this.viewport.panBy(this.viewport.deltaPointsFromPixels(new $.Point(0, 40)));
+                    this.viewport.panBy(this.viewport.deltaPointsFromPixels(new $.Point(0, this.pixelsPerArrowPress)));
                 }
                 this.viewport.applyConstraints();
                 return false;
             case 37://left arrow
-                this.viewport.panBy(this.viewport.deltaPointsFromPixels(new $.Point(-40, 0)));
+                this.viewport.panBy(this.viewport.deltaPointsFromPixels(new $.Point(-this.pixelsPerArrowPress, 0)));
                 this.viewport.applyConstraints();
                 return false;
             case 39://right arrow
-                this.viewport.panBy(this.viewport.deltaPointsFromPixels(new $.Point(40, 0)));
+                this.viewport.panBy(this.viewport.deltaPointsFromPixels(new $.Point(this.pixelsPerArrowPress, 0)));
                 this.viewport.applyConstraints();
                 return false;
             default: