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Colour discrimination ellipses in choroideremia.

Immanuel P Seitz1,2, Jasleen K Jolly3, M Dominik Fischer1,2,3

  • 1University Eye Hospital Tübingen, Elfriede-Aulhorn Straße 7, 72076, Tübingen, Germany.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|February 7, 2018
PubMed
Summary
This summary is machine-generated.

Patients with choroideremia show significant color vision deficits, particularly in tritan discrimination, prior to gene therapy. These deficits correlate with visual acuity, suggesting color tests can monitor treatment effectiveness.

Keywords:
ChoroideremiaColour discriminationColour visionColour vision deficiency

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Area of Science:

  • Ophthalmology
  • Genetics
  • Vision Science

Background:

  • Choroideremia is an X-linked genetic disorder causing progressive vision loss.
  • Color vision deficits are a known symptom of choroideremia, but require precise quantification.
  • Assessing color vision pre-gene therapy is crucial for evaluating treatment efficacy.

Purpose of the Study:

  • To characterize color discrimination alterations in choroideremia patients before gene therapy.
  • To utilize the Cambridge Colour Test (CCT), validated for retinal dystrophies.
  • To establish baseline color vision metrics for future gene therapy outcome assessment.

Main Methods:

  • Twenty eyes from 10 choroideremia patients and 10 normal controls were tested.
  • The Cambridge Colour Test (CCT) assessed color discrimination along eight axes in CIE L*u*v* color space.
  • Discrimination data were analyzed using least-squares ellipses and sensitivity thresholds.

Main Results:

  • Choroideremia patients exhibited significantly larger achromatic areas (3.85) compared to controls (2.26).
  • A significant correlation was found between achromatic area, red-green discrimination, and best-corrected visual acuity (BCVA).
  • Tritan (blue-yellow) color discrimination loss was more pronounced than red-green loss in choroideremia patients.

Conclusions:

  • Choroideremia patients display significant deficits in color discrimination, especially along the tritan axis.
  • Color discrimination thresholds correlate with BCVA, highlighting the functional impact of the disease.
  • The CCT is a promising tool for monitoring functional outcomes in choroideremia gene therapy trials.