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In SETTINGS, you can switch from “normal display” (default) to mirroring horizontally, vertically or to 180° rotation. Only occasionally do I find the time to systematically analyse the papers whether Fr ACT was actually used, so the list is incomplete. Reason for re-write was that I wanted to improve the contrast dithering.

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).For the Contrast Test, you also need to go to “SETTINGSLuminance Linearisation” to linearise luminance (“gamma correction”) before testing.But see below for a cautionary note on the difficulties of contrast testing.Final outcome should be identical, but the number of runs must be adequately chosen; see next item.Default: 24 trials with 8 gap orientation choices, 30 trials with 4 gap orientations (because the guessing rate is higher).(top right)] · Vernier ceiling: 1000 → 3000 arcmin (request by MBH) · fixed occasional Øsaving in luminance linearisation (thanks, SPH) · partial fix of crashes in Frame Cal Check after any test (thanks, OKolbe)Kg. • Keypad now works without numlock • Maximal distance increased (9999 cm instead of 999 cm), • Vernier size now scales with distance (as it should have): 0.5° total height, 0.5 arcmins bar sigma, 0.2 arcmins gap height • separate timeouts for showing the optotype (down to 0.1 s) and for responding to it • and further trivia All numerical preferences now range-checked corrected the logic in the response key evaluation (didn't stop after first match). This required changes in nearly every line of code.→ to ESU (Einschulungsuntersuchung) · now ignoring the modifiers: command, control, shift, tab · for Contrast Landolt choice of fixed pedestal luminance (for SPH) · Spezial Aalen: fester Visus (deactivated in standard edition) · fixed: in Contrast Grating, the #of choices was always 4 (thanks, SJAnderson) · CHANGE: inappropriate keys now interpreted as incorrect response · fixed regression in persistent history (3.9.8→3.9.9) · moved "Kindergarten" to a button in Settings, pertinent code → Prefs · added "Fr ACT3_last Trial Result.sol" (for Leipzig collab.) · display Transform: works with contrast-C, (2) & letter "S"· trial Info Font Size: default→9, kindergarten→24, · Quit/e Xit via "Q" or "X" · more selections for spatial frequeny (on request by Zeiss) · more crowding options · Vernier: contrast can be inverted, added type (3-line etc.) & scale (for low vision) · added sounds for stimulus on/off · shape corrections for Sloan letters K and S (error in Pelli's Sloan font) · rewrote the squarewave grating for less aliasing · corrected incomplete random assignment for letters · added one more option to crowding (now first is better names as “flanking rings”) · corrected missing result info on normal trial exit (a regression in 3.9)· added optional incomplete runs (→modified format of export2clipboard) · VA tracking now works (no longer using Pest, thanks Ross! • This is the last version that runs on Mac OS/Power PC.• added tumbling E • added optional on-line trial info • added persistent history (copied to clipboard with "z") • modernized writing to the clipboard • centered parameter-input in the SETTINGS frame • solved problem of not being able to enter "5" into the subject ID field • Quit button now labelled "Exit" in Windows • added TCP/IP based results transmission • deleted the flawed and effectless manipulation of presented direction depending on response correctness • added face recognition paradigm (experimental) • improved Alert class from Quite a number of tiny improvements: • added screen dimension to main screen info • added "force Snellen denominator to 20 ft" on request • added option for colour Landolt Cs on request • set uncalibrated values bold & red in the SETTINGS screen to make them more obvious • set focus to stage (now it responds to keyboard shortcuts after returning from SETTINGS etc.) • now possible to start with numkey-5 irrespective of numlock setting• added option to set contrast polarity • fixed silly error (fixation target in contrast testing staying on) introduced recently • added option not to go full screen (this can help with multiple screen setups) • fixed errors in the calibration check GUI resulting from the new mask code • renamed "Preferences" into "Setup", put key settings on main screen [all thanks to Daphne Mc Culloch's thoughtful suggestions]• Improved coding around the sound channels (fixed the ‘hang’), cleaned up the Pest code (no performance change, just more elegant :) ) • Added detection of sound capabilities and disabled sound settings when appropriate (does not seem to work correctly) • added a blank (or grey for contrast) mask after the response key. A major chore, which markedly improved the program internally, while not showing the changes externally. A comparison in 54 eyes found that acuity results differed between Fr ACT2 and Fr ACT3 by ≈0.01 log MAR, thus below noise limit.The downloadable stand-alone versions work independent of a browser.New: “Reward pictures” (enable “SETTINGS “Fr ACT” is a widely used visual test battery in form of a free computer program.Bach M (1996) The “Freiburg Visual Acuity Test” – Automatic measurement of visual acuity.Optometry and Vision Science –53 [pubmed] [→PDF],or, more recent: Bach M (2007) The Freiburg Visual Acuity Test – Variability unchanged by post-hoc re-analysis.

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