BaLM   by Prof. Michael Bach

Basic assessment of Light, Motion, & other perceptual thresholds

Assessing visual perception for very low acuity (below hand motion etc.) is not covered by the usual acuity tests. Thus I developed this test for Retinal Implant. They kindly made it free for general use in 2019. The test and clinical results are described here:
Bach M, Wilke M, Wilhelm B, Zrenner E, Wilke R (2010) Basic quantitative assessment of visual performance in patients with very low vision. Invest Ophthalmol Vis Sci 51:1255–1260 [PDF]

Download options

Although old, BaLM works fine in MacOS Sonoma (2024) and Windows 10/11 (Intel or ARM).

• Windows stand-alone application: BaLM3.2.exe.zip.
  On current Windows versions you will see a dialog “protected … unknown app … publisher…” or words to that effect. Need to choose “more info”, allow execution. This message is normal, it occurs because I do not pay to be a developer. This message appears only when opening BaLM for the very first time.
• MacOS stand-alone application: BaLM3.2.app.zip.
  Since MacOS 10.9: Must right click, open and confirm.