The existence of the normal blind spot within the field of vision was first noted by Mariotte in 1668. The literature fails to show evidence of interest in the further study of this area until the early part of the 19th century when Young1 described its inner edge as being 12° 56' from the point of fixation and its horizontal diameter to measure 3° 5′. In 1852 Listing2 made similar measurements but found the horizontal diameter to be 50° 55.9′, and in 1866 Helmholtz3 found the horizontal diameter to be 6° 56′. During the early part of the 20th century various investigators studied the blind spot with respect to its position in terms of degrees from the point of fixation as well as its vertical and
CHAMLIN M. Fluctuations in Size of the Normal Blind Spot. Arch Ophthalmol. 1960;64(4):522–527. doi:10.1001/archopht.1960.01840010524007
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