Sahlgren's Saturation Test for acquired dyschromatopsia: increased lightness enhances sensitivity

Area of Science:

• Ophthalmology
• Visual Science
• Colorimetry

Background:

• Sahlgren's Saturation Test (SST) is a standard tool for identifying and classifying acquired color vision defects.
• Existing SST versions utilize color samples of medium lightness, similar to other pigment-based tests.
• The effectiveness of color vision tests can be influenced by the lightness of the color samples used.

Purpose of the Study:

• To investigate the impact of varying lightness levels on the sensitivity of Sahlgren's Saturation Test (SST).
• To determine the optimal lightness setting for enhanced detection and grading of acquired color vision defects.

Main Methods:

• Five versions of the SST were created, differing solely in the lightness of their color samples.
• The study included both normal controls and individuals with congenital or acquired dyschromatopsia.
• Performance on the modified SST versions was assessed across all participant groups.

Main Results:

• Test sensitivity significantly improved as the lightness of the SST color samples increased.
• Higher lightness levels demonstrated a greater ability to detect and grade color vision impairments.
• The optimal lightness setting was identified for improved diagnostic capability.

Conclusions:

• Increasing the lightness of Sahlgren's Saturation Test significantly enhances its sensitivity for detecting acquired color vision defects.
• The lightness level of the SST has been updated from 30 to 10 Natural Color System units based on these findings.
• This adjustment is expected to improve the diagnostic accuracy of the SST in clinical practice.