Send to

Choose Destination
Optom Vis Sci. 2018 Aug;95(8):663-671. doi: 10.1097/OPX.0000000000001258.

Comparisons of Two Microperimeters: The Clinical Value of an Extended Stimulus Range.

Author information

Department of Psychology, Northeastern University, Boston, Massachusetts.
Lighthouse Guild, New York, New York.
Department of Ophthalmology, NYU School of Medicine, New York, New York.
Institut de la Vision, Aging in Vision and Action Lab, Paris, France.
Jesse Brown VA Medical Center, Chicago, Illinois *



Fundus-guided perimetry is a common clinical tool used to measure visual field sensitivities. Comparisons between perimeters are often made despite relative differences in hardware parameters. We directly compared two perimeters using Weber contrast, which allowed us to assess the clinical gain associated with the extended stimulus range of the macular integrity assessment (MAIA).


The purpose of this study was to directly compare sensitivity thresholds for two microperimeters, the MAIA and Optos optical coherence tomography/scanning laser ophthalmoscope, using Weber contrast values. We also examined the clinical utility of the extended stimulus range of the MAIA.


Six normally sighted adults with no visual field loss and 16 adults with low vision were recruited. Thresholds were measured on the MAIA and Optos using the same threshold algorithm and test points. To compare equivalent units, decibel thresholds were converted to light increments in apostilbs and then to delta increment intensities relative to each instrument's background luminance. Repeatability was assessed for normally sighted adults by testing both instruments on 3 separate days.


For normally sighted observers, mean thresholds were similar on both instruments, and repeatability within microperimeters was high. The MAIA has a 0.3-log lower contrast range and 1.37 higher contrast range. The lower contrast values did not result in lower thresholds for the normally sighted observers on the MAIA. There was a 25% increase in the number of measurable thresholds owing to the higher contrast values in low-vision observers.


The higher contrast range in the MAIA yielded only a small increase in detectable thresholds for participants with visual field loss.

[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Wolters Kluwer
Loading ...
Support Center