Letter Similarity Data Set Archive

Banister, 1927

Banister, H. (1927). Block capital letters as tests of visual acuity. British Journal of Ophthalmology, 11, 49-61.


Produced three matrices: The first two were apparently two different sets of participants in the same experiment (Exp. 1), which used briefly-presented letters presented at a distance. The third matrix (Exp. 3) used letters presented at a distance for long duration.



The characters were Dr. John Green's uppercase lettering set (an alternative to Snellen's characters) that were presented to the American Ophthalmological Society meeting in 1866 and 1868. Reproduction of chart below (Currently unable to find full alphabet of letters).


Results are available:

Exp. 1-1 data (image)

Exp. 1-2 data (image)

Exp. 3 data (image)

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