Which test is associated with the Arden ratio?

The Arden ratio is specifically associated with the Electrooculogram (EOG). This test evaluates the functionality of the retinal pigment epithelium (RPE) by measuring the resting potential between the front and back of the eye. By placing electrodes on the skin around the eyes, the EOG captures the electrical activity as the patient performs specific eye movements, typically looking from side to side. The Arden ratio itself is derived from the amplitudes of the light and dark phases of EOG recordings; it is used to assess the health of the RPE and can help detect conditions such as Best's vitelliform dystrophy and other retinal disorders.

In contrast, the other tests mentioned do not measure the same physiological parameters or employ the Arden ratio. The Electroretinogram (ERG) is used to assess the function of the retinal photoreceptors and inner retinal layers, visual field testing evaluates peripheral vision and is primarily related to visual pathway function, while Optical Coherence Tomography (OCT) provides high-resolution images of the layers of the retina and is used to examine structural integrity rather than electrical activity.