Table 2.

Battery of tests.

Interactive process	Measure	Meaning and relevance
Visual perception
	High contrast acuity	A general measure of visual capability and the ability to discern spaces between characters on a 100% contrast interface [16].
	Reading acuity	A measure of acuity when reading full words on an interface [17].
	Low contrast acuity	A general measure of visual capability and the ability to discern spaces between characters on a 5% and 25% contrast interface [18].
	Contrast sensitivity threshold	The contrast threshold at which the user can successfully identify a character [19].
	Color discrimination	Ability to discriminate colors on an interface [20].
	Low contrast acuity in low luminance	The ability to discern spaces between characters on a low contrast and poorly illuminated surface.
Cognitive processing
	Spatial reasoning	The ability to interpret space on an interface and infer relationships between elements has been cited as a major component of website usability and software interfaces in general [9,21,22].
	Short-term memory	Memory, specifically short-term memory has been cited as an important factor in one’s ability to maintain visual attention of an interface [22,23].