keratometry

This term is a specialized medical descriptor used almost exclusively within ophthalmology and optometry. It describes a precise diagnostic procedure rather than a general observation, carrying a clinical and technical register. It is typically used in the context of fitting contact lenses or calculating the power of an intraocular lens before cataract surgery.

As a technical noun denoting a specific scientific process, it is treated as an uncountable mass noun. It refers to the field of measurement or the act of measuring itself, and therefore does not have a plural form in standard medical usage.