<prompt> Arden index is related toERG ElectroretinogramEOG ElectroculogramVER Visual Evoked responsePerimetry  <response>: Electro-oculography is based on the measurement of resting potential of the eye which exists between the cornea ve and back of the eye -ve. Results of EOG are interpreted by finding out the Arden ratio as follows: Arden ratio Maximum height of light peakMinimum height of dark trough x 100 Normal curve values are 185 or above. Subnormal curve values are less than 150. Flat curve values are less than 125. Reference: A K KHURANA COMPREHENSIVE OPHTHALMOLOGY, Edition4 ,page-489,490 