Does Acuity Pro meet ANSI standards for luminance, contrast and color temperature?
Absolutely! The standard for optotypes as specified in ANSI Z80.21-1992 (R2004) states that the standard background luminance shall be 160 Cd/m2 with a range between 80 – 320 Cd/m2. Some competitive products such as those ‘chart-in-a-box’ type devices have a stated luminance of 80 Cd/m2 with a 10% tolerance. That would actually put them below the ANSI standard! All computer monitors easily provide luminance ranges of 80 – 320 Cd/m2. This is one of the beauties of Acuity Pro, the software will operate on ‘off-the-shelf’ computer hardware and be ANSI compliant. Contrast ratio’s for both CRT and LCD flat screens also far exceed the requirements for ANSI (document ISO 8596) which is stated as “…dark optotypes on a lighter background and the luminance of the optotype shall be equal to or less than 15% the luminance of the background”. Contrast ratio’s for computer monitors are typically 300:1 at the low end and many are now 600:1 and greater. This far exceeds the minimum requirements of A
