diff --git a/pupil_src/launchables/world.py b/pupil_src/launchables/world.py
index 31f9b8ebe2..8496e91034 100644
--- a/pupil_src/launchables/world.py
+++ b/pupil_src/launchables/world.py
@@ -114,6 +114,7 @@ def world(timebase, eyes_are_alive, ipc_pub_url, ipc_sub_url,
     from remote_recorder import Remote_Recorder
     from audio_capture import Audio_Capture
     from accuracy_visualizer import Accuracy_Visualizer
+    from dialation_history import Dialation_History
 
     # UI Platform tweaks
     if platform.system() == 'Linux':
@@ -152,7 +153,7 @@ def get_timestamp():
     manager_classes += [p for p in runtime_plugins if issubclass(p, Base_Manager)]
     runtime_plugins = [p for p in runtime_plugins if not issubclass(p, Base_Manager)]
     user_launchable_plugins = [Audio_Capture, Pupil_Groups, Frame_Publisher, Pupil_Remote, Time_Sync, Surface_Tracker,
-                               Annotation_Capture, Log_History, Fixation_Detector,
+                               Annotation_Capture, Log_History, Fixation_Detector, Dialation_History,
                                Blink_Detection, Remote_Recorder, Accuracy_Visualizer] + runtime_plugins
     system_plugins = [Log_Display, Display_Recent_Gaze, Recorder, Pupil_Data_Relay]
     plugin_by_index = (system_plugins + user_launchable_plugins + calibration_plugins
diff --git a/pupil_src/shared_modules/dialation_history.py b/pupil_src/shared_modules/dialation_history.py
new file mode 100644
index 0000000000..2ec9d5d1e3
--- /dev/null
+++ b/pupil_src/shared_modules/dialation_history.py
@@ -0,0 +1,88 @@
+'''
+(*)~---------------------------------------------------------------------------
+Pupil - eye tracking platform
+Copyright (C) 2012-2017  Pupil Labs
+
+Distributed under the terms of the GNU
+Lesser General Public License (LGPL v3.0).
+See COPYING and COPYING.LESSER for license details.
+---------------------------------------------------------------------------~(*)
+'''
+
+import logging
+import glfw
+from collections import deque
+from plugin import Plugin
+from pyglui import ui, graph
+
+import gl_utils
+
+# logging
+logger = logging.getLogger(__name__)
+logger.setLevel(logging.DEBUG)
+
+
+class Dialation_History(Plugin):
+    """Pupil dialation visualization
+
+    This plugin uses the 3d model's pupil diameter
+    and displays it in a graph for each eye.
+    """
+    order = .9
+
+    def __init__(self, g_pool):
+        super().__init__(g_pool)
+        self.graphs = ()
+        self.menu = None
+
+    def init_gui(self):
+        eye0_graph = graph.Bar_Graph(min_val=.0, max_val=5.)
+        eye0_graph.pos = (140, 230)
+        eye0_graph.update_rate = 5
+        eye0_graph.label = "id0 dia: %0.2f"
+
+        eye1_graph = graph.Bar_Graph(min_val=.0, max_val=5.)
+        eye1_graph.pos = (260, 230)
+        eye1_graph.update_rate = 5
+        eye1_graph.label = "id0 dia: %0.2f"
+
+        self.graphs = eye0_graph, eye1_graph
+        self.on_window_resize(self.g_pool.main_window, *glfw.glfwGetFramebufferSize(self.g_pool.main_window))
+
+        def close():
+            self.alive = False
+
+        self.menu = ui.Growing_Menu('Dialation History')
+        self.menu.collapsed = True
+        self.menu.append(ui.Button('Close', close))
+        self.menu.append(ui.Info_Text('Displays the recent pupil dialation in millimeters for each eye.'))
+        self.g_pool.sidebar.append(self.menu)
+
+    def recent_events(self, events):
+        for p in events['pupil_positions']:
+            diam = p.get('diameter_3d', 0.)
+            if diam > 0. and p['confidence'] > 0.6:
+                self.graphs[p['id']].add(diam)
+
+    def gl_display(self):
+        for g in self.graphs:
+            g.draw()
+
+    def on_window_resize(self, window, w, h):
+        if gl_utils.is_window_visible(window):
+            hdpi_factor = float(glfw.glfwGetFramebufferSize(window)[0] / glfw.glfwGetWindowSize(window)[0])
+            for g in self.graphs:
+                g.scale = hdpi_factor
+                g.adjust_window_size(w, h)
+
+    def get_init_dict(self):
+        return {}
+
+    def deinit_ui(self):
+        self.graphs = ()
+        self.g_pool.sidebar.remove(self.menu)
+        self.menu = None
+
+    def cleanup(self):
+        if self.menu:
+            self.deinit_ui()