20/10/2026
An electroretinogram (ERG) with no response (flat line) means that the retina at the back of the eye is non functional. In a normal eye with cataract enough light still passes through the cloudy lens to elicit an electrical response from a healthy retina. A completely flat ERG confirms that the blindness or vision loss is not just due to cataract but is caused by underlying retinal failure so cataract surgery is not recommended . Removing the cloudy lens won't restore vision if the underlying structure responsible for sending visuals signals to the brain is permanently damaged 🐶🐕