Chan PP, et al. - In patients with ocular hypertension (OHT), and their corresponding estimated 5-year risk for development of glaucoma, authors compared the vertical cup to disc ratio (VCDR) measurements obtained with optical coherence tomography (OCT), Heidelberg retina tomography (HRT) and stereophotography of the optic nerve head (ONH). In untreated OHT eyes, the disagreement in VCDR measured by OCT, HRT and stereophotography extends to their 5-year risk estimation of glaucoma development. They noted 0.64 to be the maximum difference of VCDR measurement, while 24.02% was the maximum difference of the corresponding 5-year risk.