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All selections in SETTINGS are automatically saved.

Apart from using the obvious buttons a test run can also conveniently be started from the numerical keypad (digit 5).

In narrow environments the standard 4 m distance may be difficult to achieve.

In such conditions, high-quality front surface mirrors can be employed.

It uses psychometric methods combined with anti-aliasing and dithering to provide automated, self-paced measurement of visual acuity (Bach 1996), contrast sensitivity and vernier acuity.

The progression of optotype sizes relies on a Bayesin approach and is determined by the “Best PEST” strategy (Lieberman & Pentland, see below).

Fr ACT complies with the European Norm for acuity testing (EN ISO 8596) and is endorsed by the DOG.

It is employed all over the world in vision labs, by optometrists, ophthalmologists and in clinical trials (→Who used Fr ACT in over 100 publications) and has been verified in independent laboratories (→Descriptions & Validations).This keeps your subjects happy, especially since the last trial is thus always a ‘success’. Thus, if you duplicate (appropriately renaming it) or put a copy in a different location, each will have their ‘personal’ SETTINGS; to switch between different sets of SETTINGS, just quit/exit and start the other version. Additionally, the result can be transferred to the clipboard (in a simple, final-result-only or full-history fashion); so just switching to a spreadsheet program running in the background allows pasting the result.Often one wants different sets of SETTINGS, e.g., for training vs. As of version 3.6, TCP/IP-based result transmission is also available, using a standard URL-request GET call.Enter the position of the appearing Landolt-C's gap via the numerical digit keys.These are spatially mapped to the 8 possible gap positions in an obvious way (“8”=top, “9”=top right, etc.).Response keys: For 4 directions the cursor keys are fine, for 8 directions the response keys are geographically arranged on a numeric keypad. Fr ACT was employed 200 papers (“Who used Fr ACT” below) and cited in ≈800.

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