A Study of Intraocular Pressure with I Care Tonometer & Applanation Tonometer

Purpose: To compare the Intra Ocular Pressure (IOP) measurements obtained by Applanation Tonometer (AT) & Rebound Tonometer (RT). Methods: The Central Corneal Thickness (CCT) corrected IOP of 100 eyes were measured using first with RT (I Care) followed by AT (GAT). Results were compared statistically using Bland –Altman plot & Deming’s regression analysis. Results: Scatter plot analysis showed that for the same value of IOP measurement with I care , corresponding IOP measurement with GAT do not show much variation except for the extreme values of IOP. Bland – Altman plot analysis showed that there is no systematic difference between the measurements with both instruments in the normal range, but show systematic differences for too high & too low values. Deming’s regression analysis confirmed a reasonable agreement between both instruments. Conclusion: There is a positive correlation in our study & the IOP measured with both applanation & rebound tonometer does not vary much except for the extreme values.