Related Experiment Video
Updated: May 24, 2026
07:41
Behavioral Assessment of Visual Function via Optomotor Response and Cognitive Function via Y-Maze in Diabetic Rats
Published on: October 23, 2020
Visual acuity and retinal function in patients with Bardet-Biedl syndrome
Adriana Berezovsky1, Daniel Martins Rocha, Paula Yuri Sacai
1Universidade Federal de São Paulo/Escola Paulista de Medicina, Departamento de Oftalmologia, Brazil. aberezovsky@oftalmo.epm.br
Clinics (Sao Paulo, Brazil)
|February 24, 2012
Summary
Bardet-Biedl syndrome significantly impacts vision, with most young patients experiencing severe visual impairment and absent retinal function. Early detection and management are crucial for preserving sight in individuals with this genetic disorder.
Area of Science:
- Ophthalmology
- Genetics
- Medical Research
Background:
- Bardet-Biedl syndrome (BBS) is a rare, inherited disorder affecting multiple organ systems.
- Key features include progressive retinal dystrophy leading to severe visual impairment, obesity, and developmental abnormalities.
- Understanding the early visual manifestations is critical for patient management.
Purpose of the Study:
- To evaluate visual acuity and electroretinogram (ERG) findings in a cohort of Bardet-Biedl syndrome patients.
- To characterize the extent of visual impairment and retinal dysfunction in BBS.
Main Methods:
- Assessed visual acuity in 23 patients (ages 6-36).
- Performed full-field electroretinography (ERG) to evaluate retinal function.
- Measured dark-adapted visual thresholds.
Main Results:
- Only 21.7% of patients had visual acuity of 20/40 or better; the mean acuity was 20/100.
- Scotopic (rod) ERG responses were undetectable in 91.3% of patients.
- Cone responses were undetectable in 65.2%, and elevated dark-adapted thresholds were noted in all assessed patients.
Conclusions:
- A significant majority of young Bardet-Biedl syndrome patients exhibit poor visual acuity and severe retinal dysfunction.
- Absence of scotopic ERG responses is common, indicating early rod photoreceptor damage.
- These findings highlight the rapid and detrimental effects of BBS on vision and retinal function.
