perometrie

Perométrie is a term whose meaning depends on language and field, and it is not universally used to denote a single technique. In ophthalmology, the related term périmétrie (visual field testing) is the standard concept for measuring the scope and sensitivity of a person’s vision. In electrochemistry and analytical chemistry, amperométrie (amperometry) refers to techniques that monitor current while a fixed potential is applied to an electrochemical cell. Because some sources render the word without diacritics, the term can be ambiguous without context.

Périmétrie, in the ophthalmic sense, is a functional test of the visual field. It assesses how far to the periphery a patient can detect visual stimuli presented at various locations and intensities. There are static perimetry methods, which present fixed-intensity stimuli at different locations, and kinetic perimetry methods, which move a stimulus along the boundary of the visual field. Results are typically summarized in a sensitivity map and numerical indices such as mean deviation and pattern standard deviation. Périmétrie is commonly used in diagnosing and monitoring glaucoma, retinal diseases, and neurological conditions that affect the visual pathways.

Amperométrie, in electrochemistry, measures current as a function of time or potential to study redox reactions. In amperometry, a working electrode is held at a controlled potential, and the resulting Faradaic current is related to the concentration of electroactive species. Techniques include chronoamperometry (current vs time at fixed potential). Amperométrie is widely used in sensor development, environmental monitoring, food and pharmaceutical analysis, and catalysis research, often in conjunction with three-electrode configurations and various pulse or potential steps to enhance selectivity and sensitivity.

See also: perimetry, amperometry, electrochemical sensing.