What you need to know about the latest perimeter from Heidleberg UK

Most patients have their visual fields screened at every eye examination. Typically, this might take the form of a suprathreshold test specific enough for normal patients to pass, but sensitive enough to detect significant localised loss. For those deemed to be at risk of field loss related to retinal nerve damage, a more sensitive, full threshold assessment is preferred.

Algorithms have been developed over the years that can be undertaken quickly, by using such strategies as the SITA (Zeiss Humphrey) or ZATA (Henson) algorithms. Furthermore, tests aimed at specific ganglion cells likely to be the first damaged have been introduced, such as frequency doubling technology and short wavelength perimetry.