Colour discrimination ellipses in patients with dominant optic atrophy

Area of Science:

• Ophthalmology
• Optometry
• Genetics

Background:

• Standard color vision tests are often inaccessible to patients with low vision due to high visual acuity requirements.
• Assessing color vision in visually impaired individuals is crucial for understanding visual function and disease progression.

Purpose of the Study:

• To adapt an existing color vision test for individuals with sub-normal visual acuity.
• To evaluate the modified test's performance in patients with dominant optic atrophy.
• To investigate phenotypic variations in dominant optic atrophy.

Main Methods:

• A previously described color vision test was redesigned with coarser spatial details for resolutability by subjects with severe visual impairment.
• The revised test assesses chromatic discrimination across 20 axes within the CIE 1976 L*u*v* color space.
• The test was administered to a cohort of patients diagnosed with dominant optic atrophy.

Main Results:

• The redesigned test successfully enabled color vision assessment in patients with low visual acuity.
• Phenotypic variation in color vision was observed among dominant optic atrophy patients, both between and within families.
• These findings highlight the heterogeneity of dominant optic atrophy, even without clear genetic distinctions.

Conclusions:

• The modified color vision test is a valuable tool for evaluating visual function in patients with severe visual impairment.
• The study underscores the importance of considering individual phenotypic variability in dominant optic atrophy.
• Further research may elucidate the factors contributing to this observed phenotypic heterogeneity.