| Description | Logarithmic chart uses traditional Sloan optotypes. These calibrated optotypes blur at threshold and adhere to the Snellen 5x5 grid. Sloan chart uses two smaller groups for repetitive testing and minimizes memorization. Logarithmic Sloan acuity | This translucent eye chart uses Sloan optotypes for accurate testing. Each optotype has been calibrated for size, difficulty, threshold blur, and dimension. Each line is arranged equally. This eye test also includes two smaller groups for repetitive |