Correction: Online circular contrast perimetry via a web-application: optimising parameters and establishing a normative database

Repeatability of Online Circular Contrast Perimetry Compared to Standard Automated Perimetry

“…The OCCP (Eyeonic) online application has been described in previous papers 25–27 . In essence, OCCP provides perimetry via the web browser to work on any computer.…”

“…FP responses were recorded where clicks occurred outside the accepted response window. Similar to SAP, FN responses were recorded when participants failed to respond to stimuli at higher contrast in areas of normal threshold sensitivity and are described in further detail elsewhere 25,26 . To account for interuser variability, responses were time-adapted based on the user’s previous response time; there were also inbuilt delays that occurred at random to prevent rhythmic responses.…”

“…MD is a validated global endpoint used in similar studies to assess repeatability 19,43 . OCCP MD, pattern standard deviation (PSD), and visual index (VI) values were calculated from an established normative data set 25 . Secondary outcome measures were other perimetric parameters including PSD, VI/visual field index (VFI), reliability indices, and test duration.…”

“…Online circular contrast perimetry (OCCP) is a validated perimetry application that offers VF testing on any computer, laptop, or tablet with an internet connection, and without additional hardware 25 . Its minimal hardware requirements make OCCP versatile, cost-effective, and easy to operate remotely, which is an advantage over other portable perimetry devices, therefore, offering a practical and affordable avenue for home perimetry.…”

“…23,24 Online circular contrast perimetry (OCCP) is a validated perimetry application that offers VF testing on any computer, laptop, or tablet with an internet connection, and without additional hardware. 25 Its minimal hardware requirements make OCCP versatile, cost-effective, and easy to operate remotely, which is an advantage over other portable perimetry devices, therefore, offering a practical and affordable avenue for home perimetry. In a cohort study of both patients with glaucoma and healthy controls (n = 95 and n = 125), OCCP was found to have comparable diagnostic accuracy to both SAP and optical coherence tomography (OCT) scans of the retinal nerve fiber layer (RNFL) and macular ganglion cell complex.…”