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Diurnal Variation of Retinal Thickness in Healthy Subjects

Ashraf, Hossein*; Nowroozzadeh, Mohammad H.*

Optometry and Vision Science: June 2014 - Volume 91 - Issue 6 - p 615–623
doi: 10.1097/OPX.0000000000000269
Original Article

Purpose To investigate diurnal fluctuations in retinal thickness using spectral domain optical coherence tomography (SD-OCT).

Methods Spectralis SD-OCT was used to obtain data from the right eye of 21 healthy subjects (mean age, 31.3 years) at 7 AM, 1 PM, and 7 PM. For each eye, a full peripapillary retinal nerve fiber layer circular scan and a 19-line horizontal raster scan (6- by 6-mm area) centered on the fovea were performed.

Results Retinal nerve fiber layer thickness was greater at 7 AM or 1 PM than at 7 PM for nasal (79.1 μm [1 PM] vs. 77.6 [7 PM]; p = 0.024), inferior (134.1 [7 AM] vs. 131.9 [7 PM]; p = 0.009), and inferonasal (115.2 [7 AM] vs. 115.6 [1 PM] vs. 112.4 [7 PM]; p < 0.001) subfields. Macular thickness was greater at 7 AM than at 7 PM for inferior 6 mm (290.2 μm [7 AM] vs. 287.8 [7 PM]; p < 0.001) ETDRS (Early Treatment Diabetic Retinopathy Study) subfield. Macular volume was greater at 7 AM than at 7 PM for nasal 3 mm (0.541 mm3 vs. 0.538; p = 0.028) and inferior 6 mm (1.538 vs. 1.525; p < 0.001) ETDRS subfields. The remaining studied areas did not show any significant change throughout the day.

Conclusions The Spectralis SD-OCT retinal thickness measurements showed a small but statistically significant diurnal variation in nasal and inferior subfields toward smaller values in the evening. However, the overall change is close to the instrument’s resolution and repeatability.

*MD

Poostchi Ophthalmology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.

Mohammad H. Nowroozzadeh Poostchi Ophthalmology Research Center Poostchi Eye Clinic Zand Street Shiraz, Iran e-mail: norozzadeh@gmail.com

© 2014 American Academy of Optometry