Needs for precise measures of acuity. Equipment to meet these needs
L. L. Sloan
The equipment described provides precise, reliable measures of acuity from
normal to the lowest measurable and meets all recommendations of the
NAS-NRC Working Group 39 of the Committee on Vision. Special features of
the equipment are as follows: (1) It is a valuable component of a complete
clinical eye examination. (2) Because it measures very low acuities, it is
excellent for use in low-vision clinics. (3) It meets the demanding
requirements of collaborative research studies in which acuity is the
primary measure of the effects of therapy. These studies involve tests at
repeated intervals under conditions that can be duplicated in a number of
examining centers. The adoption of one standard method of measuring acuity
for these diverse needs would aid in establishing a sound, generally
understood foundation for this basic measure of visual function.
