When your ophthalmologist looks at the map of your visual field, they are looking for areas that are less sensitive to light than what is found in a healthy eye. Certain areas of the visual field are more often affected in glaucoma. These can help your ophthalmologist to diagnose glaucoma and start early treatment.
The Picture on the left shows a healthy left eye, the central portion of the visual field corresponds to the area of best vision. The visual field map shows the lightest areas (best vision) are in the center, with some reduction in sensitivity in the periphery, even in the normal field. The darkest area corresponds to the normal blind spot.
If you have glaucoma, and some loss of visual field is present, you will be followed carefully with repeated testing to determine if the problem has been halted or if further loss is advancing.
The glaucoma eye shown in the right picture requires more light than normal in all areas of the field. The visual field map is much darker than normal, especially in the peripheral areas.
The ongoing and repeated testing is very important for the proper management of your glaucoma.
You may want to use VisionField once or twice a month to make sure your glaucoma condition is not worsening.
A healthy eye will show a vision field with most values between 25 and 35, and only one -1 values, showing the normal blind spot.
By default, VisionField shows the Visual Field quality in shades of black, but since the test report colors can be modified by the user, using the Preferences window, the actual colors may not be the same than the colors shown here.