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Kingella kingae microbial keratitis in a human immunodeficiency virus patient with orthokeratology lens wear

This equation shows a quadratic relationship between the flow rate and the pressure drop, rather than the linear relationship in Equation (1). Even without neglecting gravity, if the transducer is held at a relatively consistent elevation relative to the exit of the duct, then the gravitational term would be constant and the quadratic relation between pressure and flow rate would remain. If Equation (9) is used, results from different studies that use different flow rates may be more accurately compared. Stanley et al. injected distilled water into 13 normal lacrimal systems at a rate of 0.3 mL/s. Average lacrimal resistance was 103 mmHg/(mL/s) using Equation (1). Tucker et al. flushed distilled water at a rate of 0.14 mL/s through 43 healthy tear ducts. They also used Equation 1 and calculated mean resistance to be 49.5. Both studies investigated healthy tear ducts but had substantial differences in their resistances when using Equation 1. However, using Equation (9), R* in Stanley et al. would be 343 and in Tucker et al. would be 354. As these R* values are similar, this would suggest that Equation (9) may be useful for comparison between studies with different flow rates. As with any equation used to model a real‐life system, the calculated results will not perfectly match the real‐life system. However, we propose that Equation (9) can also be used in future studies to help compare resistance values found in different studies, as it more accurately represents the relationship between pressure and flow rate. This equation may also eventually allow comparison of resistances between normal and obstructed tear ducts.