Clinical Characteristics of Comorbid Retinal Dystrophies and Primary Angle Closure Disease

Abstract Purpose: To assess the clinical characteristics of comorbid retinal dystrophies and primary angle closure disease.Design: Retrospective study from January 1992 to June 2020.Methods: This descriptive study included 92 eyes of 46 patients with comorbid retinal dystrophies and primary angle closure disease (PACD) that included eyes with primary angle closure suspect, primary angle closure and primary angle closure glaucoma. Demographic profile, clinical characteristics of PACD and its association with retinal dystrophies are described. Results: The study included 46 patients (92 eyes). Males were majority, 63%. Mean (± standard deviation) age when retinal dystrophy was diagnosed was 29.6 ± 9.4 years and PACD was diagnosed at 32.23±7.92 years. Mean BCVA at presentation was 1.07±0.87 log MAR (95% confidence interval (CI):0.87,1.26). Mean Intraocular pressure at diagnosis of glaucoma was 27±16 mmHg (95% CI:23.5,31.5 mmHg). The most common retinal dystrophy associated with PACD was retinitis pigmentosa (RP) followed by RP with retinoschisis. The hospital-based prevalence of PACD among all patients with RP and retinoschisis was 0.19% and 0.15% respectively. Laser peripheral iridotomy (LPI) was performed in 74 eyes (80.5%). Glaucoma was managed medically in majority of the eyes (58 eyes, 63.04%) and minority required surgical management with trabeculectomy (11, 11.9%). Conclusion: Retinitis pigmentosa is the most common retinal dystrophy associated with PACD. Comorbid PACD in eyes with retinal dystrophies was observed in 2nd to 3rd decade of life. This calls for screening for angle closure in eyes with retinal dystrophies from second decade onwards to identify the comorbid PACD and treat or refer them appropriately.