At each study visit, participants viewed a logMAR-style eye chart from a chin and forehead rest and read one letter at a time, monocularly. At the final study visit, this was done first with the best refraction and then unaided. The chart was composed of lines with five letters each of either the British Standard (D, E, F, H, N, P, R, U, V, and Z) or a restricted set (H, O, T, and V) with one repeated letter per line, along with a matching card if needed depending on the cognitive ability of the participant. The largest line (0.8 logMAR) was presented first, continuing line by line until the participant made five total mistakes. Final logMAR acuity was scored letter-by-letter such that each letter was equal to 0.02 logMAR, and the total score of correct letters (number of correct letters times 0.02) was subtracted from 0.9 logMAR. The monitor displaying the letters was positioned 12.2 feet from the forehead rest in the standard condition. To continue testing at this distance, participants were required to correctly read four of the five letters on the largest letter size displayed (0.8 logMAR). When testing participants unaided, the standard test distance was also used, except for four participants with high myopic refractive error who were unable to correctly identify 4 of 5 letters on the 0.8 logMAR line from 12.2 feet away. These individuals were moved closer to the monitor until they could successfully read the top line of letters. Acuity testing continued at the reduced test distance and acuity was later converted to reflect the adjusted logMAR score for the reduced testing distance.