How does the 'Area' function work when using Bulbar Redness mode?

The Bulbar Redness tool presents results showing the Conjunctival Total Redness on a 0-4 scale (based on Efron Grading Scale) and the Vessel coverage for the selected area.

How to draw an area

Step 1: Select an image to analyse, click 'Bulbar', and then select 'Analyse Bulbar Redness', Figure 1.        

Figure 1

Step 2: Using the mouse, start from one corner of the area of interest and left click to place an anchor point (indicated by a small square).

Step 3: From here continue to move the mouse and left click in short intervals to form a border around the desired area, see Figure 2.

Note: This mode only creates straight lines, therefore, when covering more detailed areas additional anchor points will be required to improve accuracy.

                         

Figure 2

Step 4: To finish, make your way around to the first anchor point and left click to complete the selection.  Results are displayed in the results panel at bottom of the screen, Figure 3.

Figure 3

Step 5: While the results are being displayed you can make any adjustments to the selection area, by clicking and dragging the anchor points or clicking in between two anchor points to insert another anchor point. The results will be actively updated. 

Step 6: If you make a mistake, you can click the 'Reset' button and start again.

Redness Map 

Step 5: After an area has been drawn activate the following feature by clicking 'Redness Map', as shown in Figure 4.

Figure 4

 

Step 6: Once activated, the area will appear as a colour heatmap, Figure 5.

The grading chart is based on the Efron Grading Scale 0-4 appears in the results panel at the bottom left of the screen. 

Figure 5