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Current best-practice hydration assessment include techniques involving isotope dilution to estimate total body water; osmolality of blood, saliva, or urine; specific gravity or colour of urine; and changes in body mass. These techniques are either prohibitively expensive, invasive, require clinical laboratory equipment, rely on a non-dehydrated baseline criterion, or on body fluids that are compromised in a dehydrated individual. In this study we report on the capability of intraocular pressure (the pressure within the eye; IOP), to assess dehydration. IOP can be measured quickly and accurately using a handheld device (tonometer), therefore offering portability, and sterility, and can be used by anyone following minimal training [1].

An eye on hydration: efficacy of intraocular pressure to measure body water deficit