This allows improved balance of uncorrected visual acuity. Sloths have colour vision, but have poor visual acuity. The density of the photoreceptors is critical in determining the maximum attainable visual acuity. A deficiency is night-blindness followed by decreased visual acuity. He recovered well, retaining normal intelligence and normal visual acuity. Acuity and color vision can be affected independently. They found no lasting decrease in visual acuity. It also depends on patient age and their visual acuity before surgery. A Snellen chart is one type of eye chart used to measure visual acuity. This gives inaccurate visual acuity and color discrimination. A Snellen chart is an eye chart that can be used to measure visual acuity. Obviously, people's visual acuity varies greatly. Evidence suggests that atropine penalization is just as effective as occlusion in improving visual acuity. An eye chart is a chart used to measure visual acuity. Blindness is defined as a best-corrected visual acuity worse than 1.3 LogMAR.