diff --git a/README.md b/README.md
index 790462087e2a87d08b71a39403afabe98de81e3e..7d1abc1816467fe2d9f6f0e5793b7d85428f3a33 100644
--- a/README.md
+++ b/README.md
@@ -62,6 +62,7 @@ This will allow the CSP checks to pass that are served up by Reticulum so you ca
 - `disable_telemetry` - If `true` disables Sentry telemetry.
 - `log_filter` - A `debug` style filter for setting the logging level.
 - `debug` - If `true` performs verbose logging of Janus and NAF traffic.
+- `disableTunnel` - Tunnel vision is on by default. Disable the tunnel vision by this parameter.
 
 ## Additional Resources
 
diff --git a/src/systems/tunnel-effect.js b/src/systems/tunnel-effect.js
index d7b7f09977941ddc6da8798f03889f3a38c35a18..8c748e0a660c1c5a4982a784debcd20c68ce838b 100644
--- a/src/systems/tunnel-effect.js
+++ b/src/systems/tunnel-effect.js
@@ -74,7 +74,7 @@ AFRAME.registerSystem("tunneleffect", {
         Math.abs(r - TARGET_RADIUS) > CLAMP_RADIUS &&
         Math.abs(softness - TARGET_SOFTNESS) > CLAMP_SOFTNESS
       ) {
-        if (this.deltaR !== 0 && this.deltaS !== 0) {
+        if (!this.deltaR && !this.deltaS) {
           this.deltaR = TARGET_RADIUS - r;
           this.deltaS = softness - TARGET_SOFTNESS;
         }