The size of the normal blind spot was found to be markedly dependent upon the stimulus value of the target. Minor reduction in value of clinically useful stimuli produces significant enlargement of the normal blind spot. This increase involves mainly the upper and lower poles and may break through the isopter producing true baring of the blind spot. The size of the normal blind spot was not related to ocular pressure level or to family history of glaucoma. Changes in blind spot size cannot be usefully employed in the diagnosis or management of open-angle glaucoma.
Armaly MF. The Size and Location of the Normal Blind Spot. Arch Ophthalmol. 1969;81(2):192-201. doi:10.1001/archopht.1969.00990010194009