Diagnosys equipment is capable of performing the following protocols:

Full field ERG (ffERG), Multifocal ERG (mfERG), Pattern ERG (PERG), Photopic Negative Response (PhNR), Pattern VEP, Flash VEP, Stepwise Sweep VEP, Electro-oculogram (EOG), and Electrically Evoked Response (EER) tests.

The resulting size, shape, and delay of various components of the response waveforms are indicators evaluated by health practitioners to assist in the diagnosis of various disorders of the visual system.

In an attempt to standardize the practice of clinical electrophysiology, an organization called ISCEV – the International Society for the Clinical Electrophysiology of Vision – established in 1978 – began to publish best practice protocols based on collective consensus about setup parameters for particular electrophysiology tests that its members’ research had shown optimal in aiding diagnosis of potential diseases of the eye and visual pathways.


The ISCEV Standard procedures are linked in the article below:

Michaelides M, Pennesi ME, Stingl K, Vincent A, Weng CY. The RUSH2A study: Best-corrected visual acuity, full-field electroretinography amplitudes, and full-field stimulus thresholds at baseline. Trans Vis Sci Tech. 2020;9(11):9,

Robson AG, Nilsson J, Li S, Jalali S, Fulton AB, Tormene AP, Holder GE, Brodie SE (2018) ISCEV guide to visual electrodiagnostic procedures. Doc Ophthalmol 136:1–26.

Tahir HJ, Rodrigo-Diaz E, Parry NRA, et al. Slowed dark adapta- tion in early AMD: dual stimulus reveals scotopic and photopic abnor- malities. Invest Ophthalmol Vis Sci. 2018;59:AMD202–AMD210.

Consult our experts