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(Investigative Ophthalmology and Visual Science. 2005;46:3712-3717.)
© 2005 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.05-0266
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Evaluation of the Structure-Function Relationship in Glaucoma

Stuart K. Gardiner, Chris A. Johnson, and George A. Cioffi

From Discoveries In Sight, Devers Eye Institute, Portland, Oregon.

PURPOSE. While glaucoma is evaluated on the basis of structural and functional test results, the spatial relationship between structure and function is not well defined. This study produces a topographical map to demonstrate how sectors of the optic nerve head (ONH) are related to locations in the visual field, using empiric cross-sectional patient data.

METHODS. One hundred nine subjects with healthy eyes and 166 subjects with diagnosed or suspected glaucoma (one test per patient) were evaluated using a retina tomograph and white-on-white standard automated perimetry (SAP). The tomograph ONH images were divided into 36 sectors; and the sector rim areas normalized to account for changes in the total rim area. These were then correlated with SAP thresholds. For each visual field location, a map was produced indicating the strength of correlation between the normalized sector rim areas and thresholds.

RESULTS. The highest correlation between a sector’s normalized rim area and a SAP location’s sensitivity was 0.520. Twenty-seven of the 52 non–blind spot SAP locations exhibited a correlation greater than 0.2 with at least one ONH sector. Locations in the superior hemifield were usually best correlated with the polar inferior temporal sectors of the ONH; locations in the inferior hemifield were usually best correlated with the polar superior temporal sectors of the ONH.

CONCLUSIONS. A map relating regions of the ONH to SAP test locations has been produced. This map may be useful in elucidating the structure-function relationship, particularly for cases of localized glaucomatous loss.




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