Abstract
BackgroundOptical coherence tomography (OCT) is being used increasingly to evaluate and manage a variety of retinal diseases, but not much is known about the minification of the OCT images in gas-filled eyes. The purpose of this study was to investigate the effect of gas-filled eyes on the size of the OCT images.MethodsThis was retrospective case series of 81 consecutive eyes of 79 patients who had macular hole surgery between April 2012 and September 2014. Images of the optic disc were taken with a spectral domain-OCT instrument 2 days after surgery in gas-filled, pseudophakic eyes and from the same eyes but fluid-filled one month after the surgery. The vertical length, horizontal width, and the area of the optic disc were measured in the OCT images.ResultsClear images were obtained from 50 eyes of 49 patients (mean age 66.4 ± 5.9 years). The mean vertical length and mean horizontal width of the optic disc in the gas-filled eyes were about 25 % shorter than that of fluid-filled eyes (vertical, 1213.8 ± 170.5 and 1650.6 ± 195.9 μm, P < 0.01; horizontal, 1169.4 ± 143.1 and 1526.4 ± 219.9 μm, P < 0.01). The mean area of the optic disc was 1.12 ± 0.34 mm2 in gas-filled eyes which was significantly smaller than that in fluid-filled eyes (1.88 ± 0.37 mm2) by 40.4 %.ConclusionsThe fundus images of gas-filled eyes are significantly smaller than that in the same fluid-filled eyes. The minification of the OCT images should be considered when analyzing images obtained from gas-filled eyes.Trial registrationTrial registration number: UMIN000007517. Date of registration: 3/21/2012.Electronic supplementary materialThe online version of this article (doi:10.1186/s12886-016-0306-1) contains supplementary material, which is available to authorized users.
Highlights
Optical coherence tomography (OCT) is being used increasingly to evaluate and manage a variety of retinal diseases, but not much is known about the minification of the OCT images in gas-filled eyes
OCT instruments that allowed photographing the fundus of gas-filled eyes with a macular hole (MH) has become commercially available [7–13]
Clear OCT images of the macular configuration was obtained from gas-filled eyes that provided important information that could be used to determine the duration of the face-down position
Summary
Optical coherence tomography (OCT) is being used increasingly to evaluate and manage a variety of retinal diseases, but not much is known about the minification of the OCT images in gas-filled eyes. OCT instruments that allowed photographing the fundus of gas-filled eyes with a macular hole (MH) has become commercially available [7–13]. This has allowed the collection of important clinical information for the diagnosis and treatment of MHs. Clear OCT images of the macular configuration was obtained from gas-filled eyes that provided important information that could be used to determine the duration of the face-down position. A recent study showed that the fundus images recorded by a wide-field scanning ophthalmoscope was minified in gas-filled eyes [14]
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