KARPE1 concluded, from a study of five cases of thrombosis of the central retinal vein, that a favorable result may be anticipated when a normal or a supernormal electroretinogram is found, whereas the end-result may be unfavorable in cases when the electroretinogram is subnormal or negative.
From my own material2 I confirmed this conclusion, emphasizing that there need be no parallel between the development of the electroretinogram and the altered appearance of the fundus. With the greater number of cases available, it is now possible to discuss this opinion in more detail.
METHODS AND MATERIAL
—The recording technique was the same as that described by Karpe. A modified contact lens was used, which may be regarded as a combined contact lens and blepharostat.8 Experience with the use of this lens, which is provided with wings, has been excellent in a large number of cases.
HENKES HE. ELECTRORETINOGRAPHY IN CIRCULATORY DISTURBANCES OF THE RETINAI. Electroretinogram in Cases of Occlusion of Central Retinal Vein or of One of Its Branches. AMA Arch Ophthalmol. 1953;49(2):190-201. doi:10.1001/archopht.1953.00920020195009