Reliability in perimetric multichannel contrast sensitivity measurements

Abstract

Background

In this study, the reliability of perimetric contrast sensitivity measurements favouring the achromatic, the red‐green and the blue‐yellow post‐receptorial mechanisms was analysed.

Methods

A new technique, multichannel ATD perimetry, provides spatial and temporal stimuli favouring the detection by an achromatic mechanism (A), from a magno or parvocellular origin or by a red‐green (RG) chromatic mechanism, with a parvocellular origin or a blue‐yellow (BY) mechanism, with a koniocellular origin. The repeatability and reproducibility of contrast sensitivity measurements with these stimuli were studied in a group of 40 healthy subjects. The analysis was carried out on 21 testing points within a 60° by 40° fovea‐centred region of the visual field.

Results

The within‐observer repeatability for the four mechanisms studied is either good or excellent when the intra‐class correlation coefficient (ICC) can be calculated. For the remaining points, the Friedman's test finds that the measurements are repeatable. The between‐observer reproducibility was either excellent or good in cases where the ICC was applied and according to the Friedman's test all results were reproducible.

Conclusions

The results obtained showed good repeatability and reproducibility with A, RG and BY stimuli, although with BY stimuli repeatability is slightly worse. Future studies on the diagnostic validity of this device are based on the fact that changes of sensitivity can be compared by means of a visual single task, contrast sensitivity measurement and using a common metric.

Key words:

• multichannel perimetry
• repeatability
• reproducibility
• agreement
• contrast sensitivity

Acknowledgements

The ATD multichannel perimeter was built thanks to the support of the Spanish Ministerio de Ciencia y Tecnología Grants DPI2000‐0116‐P4‐02 and PTR 1995‐0909‐OP, in collaboration with INDUSTRIAS DE OPTICA SA (San Cugat del Vallés, Spain).

P Capilla and MJ Luque have an intellectual proprietary interest in the ATD multichannel perimeter patent (US 7.641.344 B2).

Additional information

Funding

Spanish Ministerio de Ciencia y Tecnología