A new electroretinogram function that can move the centre of the multifocal hexagonal stimulus array

Purpose We can examine declines in visual sensitivity at arbitrary points on the retina using a precise perimetry device with a fundus camera function. However, the retinal layer causing the decline in visual sensitivity can not be identified. To investigate cryptogenic diseases, such as macular dystrophy, acute zonal occult outer retinopathy and multiple evanescent white dot syndrome, we studied a new electroretinogram function that can move the centre of the multifocal hexagonal stimulus array. Methods An electroretinographic optical system, specifically perimetric optical system, was added to an experimental device with the same optical system as a fundus camera. We also added an Edmund infrared camera EO‐0413, a lens with a focal length of 25 mm, a 45‐degree cold mirror, a halogen lamp and an 8‐inch monitor. Software was generated to show the multifocal hexagonal stimulus array on the monitor using C++Builder XE8 and to move the centre of the array up and down as well as back and forth. We used National Instruments’ USB‐6008 and their system design platform LabVIEW 2015 for data retrieval. The Nihon Kohden plate electrode NE‐113As were used to measure electrodermal activities around the eyes. Some contact lens electrodes were used to measure electrical potentials of retina. Results We used a multifocal hexagonal stimulus array with 37 elements in the software. The centre of the multifocal hexagonal stimulus array could be adjusted to the same position as the examination target of the precise perimetry. Conclusions We successfully added this new electroretinogram function to the experimental ophthalmologic device.