Abstract
To evaluate the effect of the Valsalva maneuver (VM) on anterior segment parameters and its association with refractive status. In this prospective study, 120 eyes of 120 subjects were evaluated. Subjects were divided into three groups: myopic (n=40 patients), hyperopic (n=40 patients), and emmetropic (control group, n=40 subjects). The anterior segment parameters, including keratometric, pachymetric, and anterior chamber parameters, were measured using the Sirius System (Costruzione Strumenti Oftalmici, Florence, Italy) before and during VM. There was no statistically significant difference in corneal parameters including keratometric and pachymetric values at rest or during VM in myopic, hyperopic, and control groups (p>0.05 for all). In the myopic and control groups, anterior chamber depth, anterior chamber volume (ACV), and anterior chamber angle (ACA) were significantly decreased during VM. In the hyperopic group, only anterior chamber depth was significantly decreased during VM, while ACV and ACA did not significantly change. The Valsalva maneuver may cause significant narrowing in anterior chamber depth, anterior chamber volume, and anterior chamber angle in the myopic and emmetropic groups, whereas it may affect only anterior chamber depth in the hyperopic group.
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