[Skip to Content]
[Skip to Content Landing]
August 1969

The Cup/Disc RatioThe Findings of Tonometry and Tonography in the Normal Eye

Author Affiliations

Iowa City
From the Department of Ophthalmology, University Hospitals, Iowa City.

Arch Ophthalmol. 1969;82(2):191-196. doi:10.1001/archopht.1969.00990020193008

In eyes with normal fields, the cup/disc (C/D) ratio was found to be significantly related to applanation pressure PA level, 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 PA level 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.