Can the Farnsworth D15 Color Vision Test Be Defeated through Practice?

Area of Science:

• Ophthalmology
• Vision Science

Background:

• The Farnsworth D15 test is crucial for occupational qualification.
• Individuals with color vision deficiency may be motivated to practice the D15 test for career advancement.
• Limited research exists on the learnability of the D15 test through practice.

Purpose of the Study:

• To investigate if practice can improve performance on the Farnsworth D15 test for individuals with red-green color vision deficiency.
• To determine if perfect scores are achievable after practice.

Main Methods:

• Ten subjects with red-green color vision deficiency and 15 color-normal subjects underwent initial testing, including the Farnsworth D15.
• Color vision deficiency subjects practiced the D15 test until a perfect score was achieved.
• A second D15 test was administered post-practice, with results compared to initial scores using a paired t-test.

Main Results:

• Color-normal subjects showed no errors.
• Subjects with color vision deficiency demonstrated a significant reduction in major crossovers after practice (Visit 1: 8.7/1.3 vs. Visit 2: 2.5/3.0, P < .001).
• Five subjects with dichromacy achieved perfect D15 scores post-practice.

Conclusions:

• Practice can lead to perfect performance on the Farnsworth D15 for some individuals with color vision deficiency.
• The potential for learning through practice should be considered when D15 test results impact occupational entry.