Confocal scans of the macular area can be captured and analyzed. Similar to when it performs ONH and peripapillary analysis, the HRT captures a series of up to 64 confocal images at various depths in the retina. These images are used by the HRT software to provide a series of graphical representations of the macula. As with glaucoma screening, you does not need to be dilated and imaging can be done through most cataracts. A series of images is taken in only 6 seconds, with a complete imaging session lasting only a few minutes.