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Analysis of macular cone photoreceptors in a case of occult macular dystrophy

Authors Tojo N, Nakamura T, Ozaki H, Oka M, Oiwake T, Hayashi A

Received 24 February 2013

Accepted for publication 23 March 2013

Published 8 May 2013 Volume 2013:7 Pages 859—864

DOI https://doi.org/10.2147/OPTH.S44446

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Naoki Tojo, Tomoko Nakamura, Hironori Ozaki, Miyako Oka, Toshihiko Oiwake, Atsushi Hayashi

Department of Ophthalmology, University of Toyama, Toyama, Japan

Purpose: To investigate changes in cone photoreceptors with adaptive optics (AO) fundus imaging and spectral domain optical coherence tomography (SD-OCT) in a case of occult macular dystrophy (OMD).
Patient and methods: Both eyes of a 42-year-old woman diagnosed with OMD were examined. We used an AO fundus camera to obtain images of cone photoreceptors in the macula of the OMD subject and five healthy control subjects. Correlations between the AO images and the SD-OCT images were examined. Cone photoreceptors in eight areas in the macula of OMD and healthy control subjects were analyzed and compared.
Results: SD-OCT showed a loss of the cone outer-segment tips line outside of the fovea in both eyes of the subject with OMD. The left eye with decreased visual acuity showed a discontinuous photoreceptor inner-segment and outer-segment line and cone outer-segment tips line at the fovea in SD-OCT and loss of cone mosaics as a dark spot in the AO image. In panoramic AO images and cone-density maps, less cone density was observed in a ring-like region outside the fovea than in the peripheral retina. In most of the areas examined, the cone densities were lower in the OMD eyes than in the healthy control eyes.
Conclusions: Cone densities in the macula of the OMD patient were greatly decreased. AO images were found to be useful to evaluate morphologic changes in cone photoreceptors in patients with OMD.

Keywords: occult macular dystrophy, adaptive optics, cone photoreceptor, cone analysis, optical coherence tomography

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