Case Report: Effect of Haploscopic Filter on Contrast Sensitivity Function and Color Vision Tests

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Congenital color vision defects, such as deuteranopia, significantly impact professional and leisure activities.
• Current adaptive options for individuals with color vision deficiencies are limited.

Observation:

• A 51-year-old male with congenital deuteranopia was fitted with asymmetric long-pass ChromaGen haploscopic filters.
• A 2-month follow-up revealed improved discrimination of color vision test plates (Ishihara, Farnsworth, Hardy-Rand-Rittler).
• A decrease in left-eye logMAR visual acuity and contrast sensitivity was noted.

Findings:

• The ChromaGen filters resulted in a 60% improvement in distinguishing red-green plates compared to baseline.
• Spectrophotometric analysis of the filters informed the discussion of visual outcomes.
• The study suggests potential benefits of selective transmittance filters for deutan color vision deficiency.

Implications:

• Haploscopic filters may enhance color discrimination in individuals with deutan color vision deficiency.
• Further investigation into different haploscopic lenses is needed for various color vision defects.
• Simultaneous analysis of color vision outcomes and filter transmittance spectra can elucidate efficacy mechanisms.