The present disclosure provides electroretinography devices configured to detect biopotential signals from an eye of a subject. In some embodiments, the device is configured to prevent the subjects eyelids from closing over the device when placed in contact with the anterior surface of the subjects eye. In some embodiments, the device has a Youngs modulus of no more than about 50 MPa. In some embodiments, the device includes a diffusing or refracting element configured to scatter, focus or diverge incident light. In other embodiments, the device includes a void through which incident light can enter the subjects eye without passing through any portion of the device.
