Official websites use. Share sensitive information only on official, secure websites. Address for correspondence: Selim Cevher, MD. This study included eyes of healthy emmetropic subjects. All participants underwent a detailed ophthalmologic examination. Axial length AL was measured with optical biometry. CT measurements were performed at subfoveal, 1. Central macular thickness CMT measurements were also performed at the same time. Participants were divided into two groups; Group 1 age between 20 and 30 years and Group 2 age between 31 and 40 years. CT and CMT were compared among two groups. The mean age of all the subjects was The mean subfoveal, nasal, and temporal CT was Females had thinner CT in subfoveal and nasal quadrants. In addition, age did not affect CT between 20 and 40 years. Keywords: Axial length, choroidal thickness, emmetropia, enhanced-depth imaging optical coherence tomography, ethnicity, healthy subjects. The retinal pigment epithelium and photoreceptor layer do not have a vascular structure and the only source of oxygen and nourishment of these structures is the choroid. Choroidal dysfunction and losing of the vascular structure often result in photoreceptor damage and visual impairment 1. Therefore, investigating the choroidal structure and thickness has become more important. The imaging technologies in ophthalmology have been developing in recent years. Enhanced depth imaging optical coherence tomography EDI-OCT that shows the choroid, gives information to the ophthalmologist about many details of the structure of the choroid, and choroidal abnormalities underlying various chorioretinal diseases such as central serous chorioretinopathy, 2 age-related macular degeneration, 3 polypoidal choroidal vasculopathy, 4 Vogt-Koyanagi-Harada disease, 5 and high myopia related chorioretinopathy 6. The most frequently investigated topic in these diseases is choroidal thickness CT which can be a parameter for some pathologies in the near future. To understand the alternation of the choroid in pathologies, the normal choroidal structure and baseline thickness of the choroid must be known. We studied the subfoveal, μm nasal and μm temporal CT in healthy emmetropic Turkish subjects to determine their baseline CT. In the literature, it was reported that CT may differ according to ethnicity. The mean CT in healthy subjects was investigated by researchers in different ethnic groups. For example, subfoveal CT was found ±79 μm in Indian subjects, The main goal of this study was to contribute to the literature by reporting the mean CT values in healthy emmetropic Turkish subjects. This is a prospective and cross-sectional study where healthy emmetropic subjects were Austelaian Male Escort Famous Ryan during the routine ophthalmological examination. This study was conducted in accordance with the tenets of the Declaration of Helsinki. Possible consequences of the study were explained and all participants agreed to participate in the present study. A written informed consent form was obtained from each participant. Approval for the study was obtained from the Hitit University Faculty of Medicine ethics committee. The study was performed in the Department of Ophthalmology and right eyes of healthy Turkish participants age between 20 and 40 years old were enrolled. All subjects underwent a comprehensive ophthalmic examination including refraction and BCVA, slit-lamp biomicroscopy, IOP measured using Goldmann tonometry, and fundus examination. The mean of these three measurements was used as the AL measurement for each eye. Enhanced Depth Imaging mode was used, a 6-mm horizontal single line scan, through the fovea between CT measurements Austelaian Male Escort Famous Ryan performed by measuring between the sclera and retinal pigment epithelium using a caliper system in the OCT device software manually. Measurements were taken at the subfoveal region, μm nasal to the fovea, and μm temporal to the fovea Fig. If eye movements during image acquisition were detected, measurements were excluded and retaken. Central macular thickness CMT measurement was also performed.
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