Abstract
To investigate the prevalence and characteristics of outer retinal tubulation (ORT) seen in inherited retinal degenerative diseases. A total of 354 eyes of 177 patients were examined with spectral domain optical coherence tomography. One hundred and twelve patients had retinitis pigmentosa, 58 patients had cone dystrophy, and 7 patients had the Bietti crystalline dystrophy. The images obtained by horizontal and vertical scans were analyzed to explore the possible presence of ORT, estimate their prevalence, morphologic character, and their location in the retinal layers. With spectral domain optical coherence tomography, ORT was identified in 0 of 112 patients with retinitis pigmentosa, unilaterally in 3 of 58 patients with cone dystrophy, and bilaterally in 5 of 7 patients with the Bietti crystalline dystrophy. Outer retinal tubulation was detected under the fovea, and in the outer nuclear layer, ORT was detected in the Bietti crystalline dystrophy with a significantly higher frequency than in cone dystrophy (P < 0.001). There was a higher rate of ORT in the Bietti crystalline dystrophy among inherited retinal degenerative diseases.
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