title: Choroidal Thickness, Photoreceptor Thickness, and Retinal Vascular Caliber Alterations in Dark Adaptation.
abstract: Our aim was to evaluate the alterations of subfoveal choroidal thickness (SFCT), photoreceptor layer thickness (PRT), and retinal vessel diameter in the dark and light adaptation.
  
  
  
  Twenty-four eyes of 24 healthy volunteers (12 males, 12 females) were included in this cross-sectional and observational study. The SFCT, PRT, retinal arteriole, and venule caliber measurements were performed with spectral domain optical coherence tomography in the dark (0.0 cd/m2) and under light (80 cd/m2) adapted conditions.
  
  
  
  The mean age of the participants was 30.4 ± 4.4 years (range: 22-42). The SFCT increased statistically significantly in dark adaptation (p < 0.001), then returned to baseline values following light adaptation. The PRT, retinal arteriole, and venule caliber measurements were similar in the dark and light (p > 0.05).
  
  
  
  While SFCT increased, PRT, and retinal vessel diameter did not change following transition from light to dark.
authors.affiliation: a Beyoglu Eye Training and Research Hospital, Eye Clinic , Istanbul , Turkey.
authors.forename: Cengiz
authors.initials: C
authors.lastname: Alagöz
authors.affiliation: b Pamukkale University , Ophthalmology Department , Denizli , Turkey.
authors.forename: Gökhan
authors.initials: G
authors.lastname: Pekel
authors.affiliation: a Beyoglu Eye Training and Research Hospital, Eye Clinic , Istanbul , Turkey.
authors.forename: Neşe
authors.initials: N
authors.lastname: Alagöz
authors.affiliation: c Kanuni Sultan Suleyman Training and Research Hospital, Eye Clinic , Istanbul , Turkey.
authors.forename: Nihat
authors.initials: N
authors.lastname: Sayın
authors.affiliation: a Beyoglu Eye Training and Research Hospital, Eye Clinic , Istanbul , Turkey.
authors.forename: Kemal
authors.initials: K
authors.lastname: Yüksel
authors.affiliation: a Beyoglu Eye Training and Research Hospital, Eye Clinic , Istanbul , Turkey.
authors.forename: Yusuf
authors.initials: Y
authors.lastname: Yıldırım
authors.affiliation: a Beyoglu Eye Training and Research Hospital, Eye Clinic , Istanbul , Turkey.
authors.forename: Ahmet Taylan
authors.initials: AT
authors.lastname: Yazıcı
mesh_terms: D000328:Adult; D002829:Choroid / Q000033:anatomy & histology*; D003430:Cross-Sectional Studies; D003623:Dark Adaptation; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D033401:Microscopy, Acoustic / Q000379:methods*; D009929:Organ Size; D020419:Photoreceptor Cells, Vertebrate / Q000166:cytology*; D012171:Retinal Vessels / Q000033:anatomy & histology*; D041623:Tomography, Optical Coherence / Q000379:methods*; D055815:Young Adult
keywords: Choroidal thickness; dark; light; photoreceptor; retinal vessel caliber