Visual Test- and Stimulator Systems by Prof. Michael Bach

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FrACT – for the full range of vision

• FrACT – Freiburg Acuity, Contrast & Vernier Test

BaLM – for ultra low vision

• Basic assessment of Light, Motion & 2 other perceptual thresholds

Illusions with quantitative assessment

• Rotating Snakes – Influence of luminance and temporal modulation
• Induced Grating – “Classical” brightness contrast
• Visual Acuity vs. Hyperacuity – Strongly demonstrating hyperacuity versus standard acuity
• Oblique Grating № 2 – Skye’s Oblique Grating – adjustable
• Colour Flicker Fusion Balance
• Müller-Lyer Illusion Strength – Here you can assess how much the Müller-Lyer illusion affects you
• T Illusion Strength – Here you can assess how much the T illusion affects you
• Sine Illusion Strength
• Numerosity Adapation

Freiburg Evoked Potentials (EP2000)

• Electrophysiological stimulation and measurement system on Macintosh.
  A full solution to stimulate, acquire data, and analyse them. Outdated (from 2000), but still working in several labs (2024). The follow-up version for MacOSX was not fully finished (now terminated), because MacOS turned out too much of a moving target.

Moving Grating

• Moving Grating
  A fullscreen squarewave grating, which moves left- or rightwards. You can configure the speed and spatial frequency. The lateral borders have a contrast taper to reduce luminance artifacts for low spatial frequencies. Originally developed to assess acuity of fish. Rather old…

→Visual Acuity Cheat Sheet