diff --git a/demo/browser.js b/demo/browser.js
index 412dbdea..17de5bf3 100644
--- a/demo/browser.js
+++ b/demo/browser.js
@@ -6,7 +6,7 @@ import GLBench from './gl-bench.js';
 const userConfig = {}; // add any user configuration overrides
 /*
 const userConfig = {
-  face: { enabled: false },
+  face: { enabled: true, iris: { enabled: false } },
   body: { enabled: true },
   hand: { enabled: false },
 };
diff --git a/src/human.js b/src/human.js
index 5ad54013..feab8a18 100644
--- a/src/human.js
+++ b/src/human.js
@@ -307,6 +307,10 @@ class Human {
 
       // calculate iris distance
       // iris: array[ center, left, top, right, bottom]
+      if (!this.config.face.iris.enabled) {
+        delete face.annotations.leftEyeIris;
+        delete face.annotations.rightEyeIris;
+      }
       const irisSize = (face.annotations.leftEyeIris && face.annotations.rightEyeIris)
         /* average human iris size is 11.7mm */
         ? 11.7 * Math.max(Math.abs(face.annotations.leftEyeIris[3][0] - face.annotations.leftEyeIris[1][0]), Math.abs(face.annotations.rightEyeIris[4][1] - face.annotations.rightEyeIris[2][1]))