Effects of Valsalva Maneuver on Ocular Biometric Parameters: Optical Low-Coherence Reflectometry Biometer Study.

Research paper by Alper A Mete, Sabit S Kimyon, İrfan İ Uzun, Necip N Kara

Indexed on: 21 Nov '14Published on: 21 Nov '14Published in: Seminars in ophthalmology


To evaluate the effects of the Valsalva Maneuver (VM) on ocular biometry and intraocular pressure (IOP).This prospective observational study included 55 eyes of 55 healthy volunteers. Axial length (AL), central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), corneal curvature (K-steep, K-flat and K-mean), corneal diameter (WtW), and pupil diameter (PD) were measured with a LenStar LS 900® biometer at rest and during VM. The IOP was also measured at rest and during VM measurements were compared.The VM did not have any significant influence on AL, WtW, K-flat, and K-mean (p > 0.05), but it decreased K-steep significantly (p < 0.001). Moreover, CCT and ACD decreased significantly during VM (p < 0.001), but VM increased IOP, PD (p < 0.001), and LT significantly (p = 0.002).The VM might reversibly change in IOP and ocular biometry, so it should be considered during anterior segment examinations.