The measurement of visual acuity involves the determination of the smallest high contrast target that can be resolved by the patient. Classically, this has been approached by the use of letter style optotypes, each having successively smaller stroke and gap resolution. More recently, the arrangements of letter charts have been redesigned with a logarithmic scale and with attention being paid to the uniformity of other effects such as crowding or of the choice of optotype. The resultant Ferris-Bailey-Lovie chart has become a standard for acuity testing, especially for clinical research. The letters of such acuity charts have a 0.1 logMAR step progression (1.26 X) between lines and have 5 letters per line. It has been noted that the logMAR chart could have greater resolution with finer steps between the lines and with improved repeatability by converting to a letter-by-letter scoring system.