<b>The FreiBurger: A new optotype for P300-based acuity estimation</b><b>Céline Z. Duval, Saskia B. Kaczan, Sven P. Heinrich</b>

<b>First Data Set: Visual Acuity Measurements</b>In the first data set, we collected raw data to evaluate the performance of the FreiBurger device for visual acuity measurements. This study aimed to assess visual acuity by measuring logMAR values using both the FreiBurger and Landolt C. The measurements were conducted under two conditions: with and without the use of a filter for artificial visual degradation.<b>Second Data Set: EEG Study on P300 Peak Amplitudes</b>In the second data set, we conducted an EEG study using an oddball paradigm involving 12 participants. This study aimed to evaluate differences in P300 peak amplitudes when using the FreiBurger compared to the Landolt C. The study included three distinct vision conditions:<b>Undegraded Vision:</b> Participants were tested under normal visual conditions without any artificial degradation.<b>Degraded:</b> Participants underwent testing with visual acuity artificially degraded, simulating conditions of reduced visual clarity.<b>Degraded and Restricted:</b> In this condition, both visual acuity and visual field were artificially degraded to create a more challenging visual task.<br>