Thresholds for sampled sloan letters are smaller than sample spacing

Carkeet, Andrew D., Gerasimou, Daniel F., Parsonson, Loralie R., Biffin, Krystle L., & Fredericksen, Ben J. (2008) Thresholds for sampled sloan letters are smaller than sample spacing. Optometry and Vision Science, 85(12), pp. 1142-1150.

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Purpose: Although the effect of spatial sampling on the visibility of grating stimuli is well described and well understood, little research has been conducted into the effects of spatial sampling on the visibility of letter optotypes. The purpose of this study was to investigate whether thresholds for spatially sampled Sloan letters were equal to or significantly smaller than the spacing between spatial samples.-----

Methods: For four visually normal subjects, we measured Sloan letter acuity thresholds, presented on a computer monitor, after the letters had been sampled by sampling arrays with 6.285 elements per square degree, (23.9 min of arc between samples for a square packed array). We used four different sampling arrays: square packed; hexagonally packed; a cone-like array with positive contrast; and a cone-like array with negative contrast. Thresholds were assessed using letter-counting rules and also Probit analysis.-----

Results: Although results depended on array type, and the definition of sample spacing, letter acuity thresholds were substantially less than estimates of sample spacing by between 0.290 log units (49% less) (hexagonally sampled Probit thresholds compared with spacing between hexagonal samples) to 0.136 log units (27% less) (positive contrast cone-like sampled letter-counting thresholds compared with spacing between rows of hexagonal samples).-----

Conclusions: Sample spacing is not an absolute limit for Sloan letter thresholds. By comparison with previous measurements of human foveal cone sampling of space, our findings suggest that cone sampling limits for Sloan letters could be as small as 20/4.

Impact and interest:

3 citations in Scopus
3 citations in Web of Science®
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ID Code: 19086
Item Type: Journal Article
Refereed: Yes
Additional Information: This article can be accessed free of charge from the journal website 12 months after the publication date. See Official URL above.
Additional URLs:
Keywords: Spatial sampling, Letter acuity, Sloan letters, Nyquist limit, Letter-counting, Probit, OAVJ
DOI: 10.1097/OPX.0b013e31818e8d41
ISSN: 1040-5488
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
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Deposited On: 12 May 2009 05:21
Last Modified: 29 Feb 2012 13:51

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