In eyes with normal fields, the cup/disc ratio is significantly correlated with intraocular pressure parameters, independent of age or family history of glaucoma.
Does not warrant practice change in glaucoma assessment; leaves open longitudinal validation of C/D as progression marker.
In eyes with normal fields, the cup/disc (C/D) ratio was found to be significantly related to applanation pressure PAlevel, ratio of pressure reading at the beginning of the tonogram and the tonographic estimate of aqueous outflow activity (Po/C), and C-value. The frequency of C/D > 0.3 increased significantly with the PAlevel and with the magnitude of the Po/C ratio. It increased also as the C-value became smaller. This relationship was independent of age or family history of glaucoma.
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Mansour F. Armaly (1969) studied this question.
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