S-MAIA is intended for measuring macular sensitivity, fixation stability and the locus of fixation, as well as providing infrared retinal imaging. It contains a reference database that is a quantitative tool for the comparison of macular sensitivity to a database of known normal subjects. The S-MAIA allows also the measurement of macular sensitivity and fixation under scotopic (or low light) background conditions, in addition to the standard measurement performed in mesopic conditions. Both a scotopic red (stimulus central wavelength 627 nm) and scotopic blue (stimulus central wavelength 550 nm) test modalities are available with the Scotopic model. Both modalities employ specific luminance scales and do not allow comparison with reference normal values.
A mains electricity (AC-powered), automatically operated, diagnostic, ophthalmic instrument intended for assessing the extent of the patient's peripheral visual field. Small luminous points (spots) are automatically displayed in various random positions and patient response is automatically recorded. The print-out (chart) then shows the resulting curve of the visual field. Such types include Humphrey perimeters.