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Lanthony D15 for Occupational Testing: Short-term Repeatability
1Southern California College of Optometry, Marshall B. Ketchum University, Fullerton, California.
Summary
The Lanthony D15 color vision test shows high short-term repeatability. Two trials are sufficient for occupational testing, providing reliable results for color vision deficiency assessment.
Area of Science:
- Ophthalmology
- Optometry
- Vision Science
Background:
- The Lanthony D15 test is used for color vision deficiency assessment.
- Previous reports suggest poorer repeatability for the Lanthony D15 compared to the Farnsworth D15.
- Occupational testing requires reliable and repeatable color vision assessments.
Purpose of the Study:
- To determine the short-term repeatability of the Lanthony D15 test.
- To investigate learning effects across repeated trials of the Lanthony D15.
- To establish the optimal number of trials for reliable occupational testing using the Lanthony D15.
Main Methods:
- Twenty male subjects with congenital color vision deficiency participated.
- Ten trials of the Lanthony D15 were administered in a single visit.
- Color confusion index scores were analyzed using repeated-measures ANOVA and intraclass correlation coefficient (ICC).
Main Results:
- No significant differences in color confusion index scores were found across 10 trials (P = .18).
- The intraclass correlation coefficient (ICC) for the Lanthony D15 was 0.81, indicating high repeatability.
- An average of two trials achieved an ICC of 0.8, considered sufficient for occupational testing.
Conclusions:
- The Lanthony D15 test demonstrates fairly high short-term repeatability.
- Two trials of the Lanthony D15 are sufficient for reliable occupational testing.
- While more trials may increase clinical certainty, two trials balance reliability and efficiency.
