Red Desaturation Prevalence and Severity in Healthy Patients.

Area of Science:

• Ophthalmology
• Neuro-ophthalmology
• Visual Science

Background:

• Red desaturation testing is a common clinical tool to assess optic nerve function.
• Understanding the prevalence of red desaturation in a healthy population is essential for accurate diagnosis.

Purpose of the Study:

• To determine the prevalence of asymmetric red desaturation in a healthy adult population.
• To quantify the degree of red desaturation in affected individuals.
• To explore correlations between red desaturation and demographic factors.

Main Methods:

• A cross-sectional study involving 101 healthy adults (aged 18+).
• Participants underwent a normal eye examination and were queried on monocular red perception using a standardized tropicamide bottle cap.
• Interocular percentage difference in redness perception was calculated.

Main Results:

• 23.8% of participants reported some degree of red desaturation.
• The average interocular difference in red desaturation was 9.0% (range 2%-25%).
• No statistically significant relationship was found between red desaturation and race, sex, or age.

Conclusions:

• A significant portion of the healthy population may exhibit red desaturation.
• These findings necessitate careful interpretation of red desaturation tests, especially when evaluating for unilateral optic neuropathy.
• Further research is needed to establish normative thresholds and predictors for red desaturation in healthy individuals.