In glare testing, how many controlled degrees of light does the BAT test deliver when viewing a Snellen target?

The BAT (Brightness Acuity Test) is designed to assess how glare affects visual acuity. In this test, a patient views a Snellen target while being subjected to various levels of controlled glare. Specifically, the BAT test delivers three distinct degrees of light exposure to help evaluate the impact of glare on the patient's vision. These varied light levels allow practitioners to quantify changes in visual acuity under different glare conditions, which can be particularly useful in diagnosing conditions such as cataracts or other disorders that may cause sensitivity to light. By employing these three levels, the BAT effectively simulates real-world situations where glare may impair vision, enabling a more comprehensive understanding of the patient's visual capabilities.