By Warren S. Goff. DO
The program provides one the ability to check their color vision. It is based upon the Ishihara Color Vision Plates and uses Plates 2-16. Plate one is omitted because everyone with adequate visual acuity sees the number 12. The illiterate plates are also omitted. The program identifies Total Color Blindness and Red Green Color (R-G) Deficiency. Of the latter, Protan R-G and Deutan R-G deficiencies are rated either Strong or Mild.
Also included is an Amsler Chart. One stares at the center spot while covering one eye and notes whether the grid appears grid like or distorted. If it is distorted, it is advised that you print out the Amsler Chart (Help>Instructions>Amsler) and trace the pattern that you are seeing. You should bring this into your doctor (Opthalmologist). It is an indication that there is a problem with the Macula in your eye(s). People who have known eye diseases such as Adult Onset Macular Degeneration should check this chart at least monthly. If and when changes appear, your physician should be informed promptly.
Red Desaturation is tested using the red window. If the color appears pink, dull or washed out, this may indicate a problem with the optic nerve or the nerve tracts. This and any changes in Red Desaturation should be reported to your doctor.
Visual Acuity (VA) is provided also. One must print out the VA pdf file from the menu. Please follow the instructions as to proper printing and distance requirements. There are both Near (16 inch distance) and Far (20 feet distance) Charts included. Vision is measured based upon what a normal person would be able to see and at what distance. Thus a normal person can read the 20 line at 20 feet (e.g. 20/20 Vision). They can read the 40 line at 40 feet (40/40 vision), the 60 line at 60 feet (60/60 vision), etc. If you can only read the 40 line at 20 feet but nothing lower than you have 20/40 vision. You can read at 20 feet what a normal person could read at 40 feet. Both the Far Vision and Near Vision Charts are adjusted to the 20/20 scale.
You must accept the terms above to use the program.
This is Plate 1. When you Click Next >> you will be asked what you saw:
Your answers are tabulated.
You may Start over at any time and this resets all of your answers
You may Save or Save As your results, once you have completed the test
At that point the menu options will be enabled.
You may also open saved studies.
Upon opening a saved study, the interpretation occurs immediately.
Meet all of the criteria for a Person with Red-Green Deficiencies you are considered "Definite"
If you only meet some of the criteria, you are called "Probable".
"Totally Color Blind" requires that NO Numbers were seen (X).
Your answers are provided in the right most column.
Complete instructions regarding the process is provided under
After completing the test, the Color Blindness Report is Enabled and the interpretation (above) happens.
You may switch between the Color Blindness Charts (as above) or the Amsler Chart / Instructions,
Red Desaturation and Near / Far Visual Acuity.
You can draw what you see and what you didn't. It can be saved and recalled.
A printable pdf version of the Ansler Chart and instructions are available under
Finally, the Near and Far Visual Acuity option opens the pdf for printing.
It cannot be used from a computer monitor.
The program is open source (http://tinyurl.com/67etchv)
It is a stand alone program meaning that it has no dependencies and requires no installation.
Simply extract (or compile) it into a directory of your choice and it is ready.
Warren S. Goff, DO