Lens position (LP)—defined as LP = ACD + 1/2 lens thickness (LT)—and relative lens position (RLP)—defined as RLP = LP/axial length are more easily computed from measurements obtained through optical ocular biometry, which is part of routine testing for intraocular lens (IOL) power calculations prior to cataract surgery. They could also be used to understand how the lens affects the IOP reduction seen in previous studies. Our former research found that the percentage of IOP reduction after cataract surgery in non-glaucomatous eyes with open angles is greater in patients with more anteriorly positioned lenses. In addition, we have also shown that LP is an accessible predictor with considerable predictive value for postoperative IOP change.