Background: Glaucoma's biggest treatable risk factor is elevated intraocular pressure (IOP) .Many factors have an impact on IOP, including body posture.Due to its convenience, lack of requirement for topical anaesthetic, and repeatable results, rebound tonometry has been claimed to be equivalent to the Goldmann applanation tonometer (GAT). Aim of The Work:To study the effect of body posture (supin...