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Progressive Cone Dystrophy and Cone-Rod Dystrophy.

Benjamin Kuang-Chien Chiang1, Stephen H Tsang2, Tarun Sharma3

  • 1School of Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.

Advances in Experimental Medicine and Biology
|July 30, 2025
PubMed
Summary

Progressive cone dystrophy is a rare eye disease affecting vision and color perception, often starting in teenage years. Early symptoms include reduced central vision and light sensitivity, progressing to night blindness and severe visual impairment.

Keywords:
Cone dystrophyCone-rod dystrophyX-linked

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Area of Science:

  • Ophthalmology
  • Genetics
  • Retinal Diseases

Background:

  • Progressive cone dystrophy is a group of heterogeneous retinal diseases.
  • Onset typically occurs in mid-teenage years or later.
  • Estimated prevalence is 1 in 30,000-40,000 individuals.

Purpose of the Study:

  • To describe the clinical presentation and progression of progressive cone dystrophy.
  • To highlight key visual deficits and associated conditions.

Main Methods:

  • Clinical observation and patient data analysis.
  • Review of diagnostic criteria and prevalence data.

Main Results:

  • Patients present with decreased central vision and color vision deficits.
  • Progressive visual loss includes day blindness (hemeralopia) and photophobia.
  • Later stages involve night blindness, peripheral field loss, and severe visual acuity reduction.
  • Association with X-linked cone-rod dystrophy (CORD) and high myopia noted.

Conclusions:

  • Progressive cone dystrophy leads to significant, irreversible vision loss.
  • Understanding the disease course is crucial for patient management.
  • Further research into genetic associations like CORD and myopia is warranted.