It has been hypothesised that scleral contact lens wear may potentially elevate intraocular pressure (IOP) as a result of post-lens fluid forces exacerbated by eyelid tension, or ocular versions that alter the lens fit and result in corneal bearing or increased conjunctival and scleral tissue compression. A number of studies have investigated the influence of short-term scleral contact lens wear upon IOP, using a variety of experimental paradigms. On average, in young healthy adults wearing various types of modern scleral lenses for relatively short periods (30 minutes to 8 hours), the changes in IOP are typically modest (<1.5 mmHg).