This calculator provides an estimate of the IOP that would result in a particular level of risk for developing glaucoma. Please enter values for your patient's age, pattern standard deviation, central corneal thickness, vertical cup-disc ratio, and for your desired risk of conversion to glaucoma in 5 years.

Age years (40-90)
Pattern Standard Deviation dB (0.50-4.00)
Central Corneal Thickness microns (450-700)
Vertical Cup to Disc 0 to 0.9
Threshold for 5-year risk of progression Percent
Estimated threshold to initiate treatment mmHg


Other calculators are available from the Devers Eye Institute and from the OHTS investigators. The OHTS calculator is based on the combined analysis of the Ocular Hypertension Treatment Study and the European Glaucoma Prevention Study.