CHANGES of CONE PHOTORECEPTOR MOSAIC in AUTOSOMAL RECESSIVE BESTROPHINOPATHY

Purpose:To assess the morphological changes of cone photoreceptors in eyes with autosomal recessive bestrophinopathy.Methods:Both eyes of five patients with autosomal recessive bestrophinopathyunderwent spectral domain optical coherence tomography and adaptive optics fundus imaging. The cone photoreceptor densities were measured at intervals of 100 m between 500 m nasal and temporal eccentricities from the foveal center.Results:The median age of the patients was 30 years (range, 23-45 years), and the best-corrected visual acuity ranged from 20/20 to 20/80. Adaptive optics fundus images showed reduced cone photoreceptor densities corresponding to the damages of the photoreceptor layer in the spectral domain optical coherence tomography images in four patients with relatively good best-corrected visual acuity. The cone photoreceptor densities at the center of the fovea were less than one-third of the normal cone densities (range 11,600-30,400 cells/mm²). Cone photoreceptor mosaics were visible over the lesions with serous retinal detachment and retinal edema, although they were partially hyporeflective.Conclusion:There is a significant cone photoreceptor loss in the macular region of patients with autosomal recessive bestrophinopathy, although they had relatively good visual acuity. Monitoring cone photoreceptors by adaptive optics fundus imaging should provide accurate assessments of the disease status and indications for future therapeutic interventions.