Paracentral cone dystrophy with tapetal-like sheen and mizuo phenomenon examined with different imaging techniques.
OBJECTIVE
To present a case report of a patient diagnosed with cone dystrophy, with an uncommon presentation of paracentral involvement, tapetallike sheen, and Mizuo phenomenon.


METHODS
The patient underwent complete ophthalmic examination, repeated electroretinograms, fluorescein angiography, spectral-domain optical coherence tomography, autofluorescence, and different techniques for fundus photographs (color, infrared, red free).


METHODS
Twenty-year-old male patient who manifested slight photofobia but was otherwise asymptomatic.


RESULTS
The patient had 20/20 vision in both eyes. Upon indirect ophthalmoscopy, the retina presented a metalliclike sheen. Sequential electroretinograms and multifocal electroretinogram demonstrated a decreasing photopic response, with paracentral involvement. Autofluorescence and spectral-domain optical coherence tomography allowed a better visualization of the atrophic parafoveal cones. Red-free photographs help document the tapetallike sheen and Mizuo phenomenon after 3-hour dark adaptation.


CONCLUSIONS
The final diagnosis of cone dystrophy, paracentral, with tapetallike sheen was established. Spectral-domain optical coherence tomography and red-free photographs will help better understand the pathophysiology and clinical manifestations of this uncommon disease.
Retina Department, Asociacion Para Evitar la Ceguera en Mexico, Mexico City, Mexico.
Guillermo
G
Salcedo-Villanueva
Juan M
JM
Jimenez-Sierra