Letters
The Role of Ocular Perfusion Pressure in Glaucoma Cannot Be Studied With Multivariable Regression Analysis Applied to Surrogates
Ocular perfusion pressure (OPP) is not easily directly measurable, and the difference between blood pressure and intraocular pressure (IOP) has been suggested as a simple surrogate of OPP.1 We write in relation to publications in this journal2,3 and elsewhere4 that have reported a significant association between OPP surrogates and glaucoma.