Agreement between time-domain and spectral-domain optical coherence tomography in the assessment of macular thickness in patients with idiopathic macular telangiectasia type 2.

Publication Type
Journal Article
Year of Publication
Mathew, Raeba; Sivaprasad, Sobha; Florea, Daniela; Leung, Irene; Sallo, Ferenc; Clemons, Traci; Bird, Alan C; Peto, Tunde
Date Published
Humans; Prospective Studies; Reproducibility of Results; retina; Retinal Telangiectasis; Time Factors; Tomography, Optical Coherence

PURPOSE: To estimate the conversion factors to transpose macular thickness measurements on time-domain (TD) to various spectral-domain (SD) optical coherence tomography (OCT) machines in patients with macular telangiectasia type 2a (MacTel).

PROCEDURES: Macular scans on TD- and SD-OCT were performed on patients at the same visit. The retinal thickness values in various ETDRS subfields and macular volume were compared between different OCT machines.

RESULTS: The macular thickness and volume were significantly greater (p < 0.0001, r = 0.678-0.822) on SD-OCT. The mean differences in macular thickness between TD Stratus and SD-OCT by Spectralis, Cirrus and Topcon were 62, 41 and 20 μm, respectively. The conversion factor of macular thickness from TD-OCT to Spectralis, Cirrus and Topcon were +65, +39 and +25 μm, respectively.

CONCLUSION AND MESSAGE: The estimates of conversion of macular thickness from TD- to SD-OCT using simple mean differences between machines and those by linear regression were similar suggesting that the former may be used for the longitudinal follow-up of MacTel patients.