Truetrac

OCT evaluations were performed using a Spectralis SD-OCT (Heidelberg Engineering; Heidelberg, Germania). The machine is able to record ocular movements via a confocal scanning laser ophthalmoscope (TrueTrac ®; Heidelberg Engineering, Heidelberg, Germany). TrueTrac have adapted the software to ocular movements, allowing a correct examination. Eyes that were blind due to reasons other than MS were excluded. The RNFL examination was performed by a ring scan centred on the optic nerve head. The follow-up study was made using the automatic rescan mode. The thickness of global RNFL, the temporal sector (TEMP) and the papillo-macular bundle sector (PMB) were calculated using the machine’s software, and an evaluation of subclinical previous optic neurotis was performed [23 (link)]. After excluding previous clinical and subclinical ON, the minimum value between right and left eye for the same subject was entered for analysis. Two neurologists trained in the use of the Spectralis SD-OCT performed all examinations.

Optical coherence tomography (OCT) evaluations were performed using a Spectralis SD‐OCT (Heidelberg Engineering, Heidelberg, Germany). The device is able to record ocular movements via a confocal scanning laser ophthalmoscope (TrueTrac®; Heidelberg Engineering). The software adapts to ocular movements, allowing a correct examination. The RNFL examination was performed using a ring scan centred on the optic nerve head. The follow‐up study was performed using the automatic rescan mode. Before measurement, the pupil was dilated to a diameter of approximately 5 mm using 1% tropicamide eye drops (Mydriacyl; S.A. Alcon‐Couvreur N.V., Puurs, Belgium).