Anterior / Ocular Surface Disease

Blink Rate and Ocular Protection Index

Measurement of the blink rate under standard conditions, when taken in conjunction with the tear film break up (TFBUT), allows a more realistic interpretation of the affects of tear film instability. This video explains how to calculate blink rate. It also explains how the blink rate and break up time are used to calculate the ocular protection index (OPI), which is then used to appraise the severity of dry eye and response to treatment.